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glimpse into the future of Roblox

Our vision to bring the world together through play has never been more relevant than it is now. As our founder and CEO, David Baszucki (a.k.a. Builderman), mentioned in his keynote, more and more people are using Roblox to stay connected with their friends and loved ones. He hinted at a future where, with our automatic machine translation technology, Roblox will one day act as a universal translator, enabling people from different cultures and backgrounds to connect and learn from each other.
During his keynote, Builderman also elaborated upon our vision to build the Metaverse; the future of avatar creation on the platform (infinitely customizable avatars that allow any body, any clothing, and any animation to come together seamlessly); more personalized game discovery; and simulating large social gatherings (like concerts, graduations, conferences, etc.) with tens of thousands of participants all in one server. We’re still very early on in this journey, but if these past five months have shown us anything, it’s clear that there is a growing need for human co-experience platforms like Roblox that allow people to play, create, learn, work, and share experiences together in a safe, civil 3D immersive space.
Up next, our VP of Developer Relations, Matt Curtis (a.k.a. m4rrh3w), shared an update on all the things we’re doing to continue empowering developers to create innovative and exciting content through collaboration, support, and expertise. He also highlighted some of the impressive milestones our creator community has achieved since last year’s RDC. Here are a few key takeaways:
And lastly, our VP of Engineering, Technology, Adam Miller (a.k.a. rbadam), unveiled a myriad of cool and upcoming features developers will someday be able to sink their teeth into. We saw a glimpse of procedural skies, skinned meshes, more high-quality materials, new terrain types, more fonts in Studio, a new asset type for in-game videos, haptic feedback on mobile, real-time CSG operations, and many more awesome tools that will unlock the potential for even bigger, more immersive experiences on Roblox.

Vibin’

Despite the virtual setting, RDC just wouldn’t have been the same without any fun party activities and networking opportunities. So, we invited special guests DJ Hyper Potions and cyber mentalist Colin Cloud for some truly awesome, truly mind-bending entertainment. Yoga instructor Erin Gilmore also swung by to inspire attendees to get out of their chair and get their body moving. And of course, we even had virtual rooms dedicated to karaoke and head-to-head social games, like trivia and Pictionary.
Over on the networking side, Team Adopt Me, Red Manta, StyLiS Studios, and Summit Studios hosted a virtual booth for attendees to ask questions, submit resumes, and more. We also had a networking session where three participants would be randomly grouped together to get to know each other.

What does Roblox mean to you?

We all know how talented the Roblox community is from your creations. We’ve heard plenty of stories over the years about how Roblox has touched your lives, how you’ve made friendships, learned new skills, or simply found a place where you can be yourself. We wanted to hear more. So, we asked attendees: What does Roblox mean to you? How has Roblox connected you? How has Roblox changed your life? Then, over the course of RDC, we incorporated your responses into this awesome mural.
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Created by Alece Birnbach at Graphic Recording Studio

Knowledge is power

This year’s breakout sessions included presentations from Roblox developers and staff members on the latest game development strategies, a deep dive into the Roblox engine, learning how to animate with Blender, tools for working together in teams, building performant game worlds, and the new Creator Dashboard. Dr. Michael Rich, Associate Professor at Harvard Medical School and Physician at Boston Children’s Hospital, also led attendees through a discussion on mental health and how to best take care of you and your friends’ emotional well-being, especially now during these challenging times.
📷
Making the Dream Work with Teamwork (presented by Roblox developer Myzta)
In addition to our traditional Q&A panel with top product and engineering leaders at Roblox, we also held a special session with Builderman himself to answer the community’s biggest questions.
📷
Roblox Product and Engineering Q&A Panel

2020 Game Jam

The Game Jam is always one of our favorite events of RDC. It’s a chance for folks to come together, flex their development skills, and come up with wildly inventive game ideas that really push the boundaries of what’s possible on Roblox. We had over 60 submissions this year—a new RDC record.
Once again, teams of up to six people from around the world had less than 24 hours to conceptualize, design, and publish a game based on the theme “2020 Vision,” all while working remotely no less! To achieve such a feat is nothing short of awe-inspiring, but as always, our dev community was more than up for the challenge. I’ve got to say, these were some of the finest creations we’ve seen.
WINNERS
Best in Show: Shapescape Created By: GhettoMilkMan, dayzeedog, maplestick, theloudscream, Brick_man, ilyannna You awaken in a strange laboratory, seemingly with no way out. Using a pair of special glasses, players must solve a series of anamorphic puzzles and optical illusions to make their escape.
Excellence in Visual Art: agn●sia Created By: boatbomber, thisfall, Elttob An obby experience unlike any other, this game is all about seeing the world through a different lens. Reveal platforms by switching between different colored lenses and make your way to the end.
Most Creative Gameplay: Visions of a perspective reality Created By: Noble_Draconian and Spathi Sometimes all it takes is a change in perspective to solve challenges. By switching between 2D and 3D perspectives, players can maneuver around obstacles or find new ways to reach the end of each level.
Outstanding Use of Tech: The Eyes of Providence Created By: Quenty, Arch_Mage, AlgyLacey, xJennyBeanx, Zomebody, Crykee This action/strategy game comes with a unique VR twist. While teams fight to construct the superior monument, two VR players can support their minions by collecting resources and manipulating the map.
Best Use of Theme: Sticker Situation Created By: dragonfrosting and Yozoh Set in a mysterious art gallery, players must solve puzzles by manipulating the environment using a magic camera and stickers. Snap a photograph, place down a sticker, and see how it changes the world.
OTHER TOP PICKS
HONORABLE MENTIONS
For the rest of the 2020 Game Jam submissions, check out the list below:
20-20 Vision | 20/20 Vision | 2020 Vision, A Crazy Perspective | 2020 Vision: Nyon | A Wild Trip! | Acuity | Best Year Ever | Better Half | Bloxlabs | Climb Stairs to 2021 | Double Vision (Team hey apple) | Eyebrawl | Eyeworm Exam | FIRE 2020 | HACKED | Hyperspective | Lucid Scream | Mystery Mansion | New Years at the Museum | New Year’s Bash | Poor Vision | Predict 2020 | RBC News | Retrovertigo | Second Wave | see no evil | Sight Fight | Sight Stealers | Spectacles Struggle | Specter Spectrum | Survive 2020 | The Lost Chicken Leg | The Outbreak | The Spyglass | Time Heist | Tunnel Vision | Virtual RDC – The Story | Vision (Team Freepunk) | Vision (Team VIP People ####) | Vision Developers Conference 2020 | Vision Is Key | Vision Perspective | Vision Racer | Visions | Zepto
And last but not least, we wanted to give a special shout out to Starboard Studios. Though they didn’t quite make it on time for our judges, we just had to include Dave’s Vision for good measure. 📷
Thanks to everyone who participated in the Game Jam, and congrats to all those who took home the dub in each of our categories this year. As the winners of Best in Show, the developers of Shapescape will have their names forever engraved on the RDC Game Jam trophy back at Roblox HQ. Great work!

‘Til next year

And that about wraps up our coverage of the first-ever digital RDC. Thanks to all who attended! Before we go, we wanted to share a special “behind the scenes” video from the 2020 RDC photoshoot.
Check it out:
It was absolutely bonkers. Getting 350 of us all in one server was so much fun and really brought back the feeling of being together with everyone again. That being said, we can’t wait to see you all—for real this time—at RDC next year. It’s going to be well worth the wait. ‘Til we meet again, my friends.
© 2020 Roblox Corporation. All Rights Reserved.

Improving Simulation and Performance with an Advanced Physics Solver

August

05, 2020

by chefdeletat
PRODUCT & TECH
📷In mid-2015, Roblox unveiled a major upgrade to its physics engine: the Projected Gauss-Seidel (PGS) physics solver. For the first year, the new solver was optional and provided improved fidelity and greater performance compared to the previously used spring solver.
In 2016, we added support for a diverse set of new physics constraints, incentivizing developers to migrate to the new solver and extending the creative capabilities of the physics engine. Any new places used the PGS solver by default, with the option of reverting back to the classic solver.
We ironed out some stability issues associated with high mass differences and complex mechanisms by the introduction of the hybrid LDL-PGS solver in mid-2018. This made the old solver obsolete, and it was completely disabled in 2019, automatically migrating all places to the PGS.
In 2019, the performance was further improved using multi-threading that splits the simulation into jobs consisting of connected islands of simulating parts. We still had performance issues related to the LDL that we finally resolved in early 2020.
The physics engine is still being improved and optimized for performance, and we plan on adding new features for the foreseeable future.

Implementing the Laws of Physics

📷
The main objective of a physics engine is to simulate the motion of bodies in a virtual environment. In our physics engine, we care about bodies that are rigid, that collide and have constraints with each other.
A physics engine is organized into two phases: collision detection and solving. Collision detection finds intersections between geometries associated with the rigid bodies, generating appropriate collision information such as collision points, normals and penetration depths. Then a solver updates the motion of rigid bodies under the influence of the collisions that were detected and constraints that were provided by the user.
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The motion is the result of the solver interpreting the laws of physics, such as conservation of energy and momentum. But doing this 100% accurately is prohibitively expensive, and the trick to simulating it in real-time is to approximate to increase performance, as long as the result is physically realistic. As long as the basic laws of motion are maintained within a reasonable tolerance, this tradeoff is completely acceptable for a computer game simulation.

Taking Small Steps

The main idea of the physics engine is to discretize the motion using time-stepping. The equations of motion of constrained and unconstrained rigid bodies are very difficult to integrate directly and accurately. The discretization subdivides the motion into small time increments, where the equations are simplified and linearized making it possible to solve them approximately. This means that during each time step the motion of the relevant parts of rigid bodies that are involved in a constraint is linearly approximated.
📷📷
Although a linearized problem is easier to solve, it produces drift in a simulation containing non-linear behaviors, like rotational motion. Later we’ll see mitigation methods that help reduce the drift and make the simulation more plausible.

Solving

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Having linearized the equations of motion for a time step, we end up needing to solve a linear system or linear complementarity problem (LCP). These systems can be arbitrarily large and can still be quite expensive to solve exactly. Again the trick is to find an approximate solution using a faster method. A modern method to approximately solve an LCP with good convergence properties is the Projected Gauss-Seidel (PGS). It is an iterative method, meaning that with each iteration the approximate solution is brought closer to the true solution, and its final accuracy depends on the number of iterations.
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This animation shows how a PGS solver changes the positions of the bodies at each step of the iteration process, the objective being to find the positions that respect the ball and socket constraints while preserving the center of mass at each step (this is a type of positional solver used by the IK dragger). Although this example has a simple analytical solution, it’s a good demonstration of the idea behind the PGS. At each step, the solver fixes one of the constraints and lets the other be violated. After a few iterations, the bodies are very close to their correct positions. A characteristic of this method is how some rigid bodies seem to vibrate around their final position, especially when coupling interactions with heavier bodies. If we don’t do enough iterations, the yellow part might be left in a visibly invalid state where one of its two constraints is dramatically violated. This is called the high mass ratio problem, and it has been the bane of physics engines as it causes instabilities and explosions. If we do too many iterations, the solver becomes too slow, if we don’t it becomes unstable. Balancing the two sides has been a painful and long process.

Mitigation Strategies

📷A solver has two major sources of inaccuracies: time-stepping and iterative solving (there is also floating point drift but it’s minor compared to the first two). These inaccuracies introduce errors in the simulation causing it to drift from the correct path. Some of this drift is tolerable like slightly different velocities or energy loss, but some are not like instabilities, large energy gains or dislocated constraints.
Therefore a lot of the complexity in the solver comes from the implementation of methods to minimize the impact of computational inaccuracies. Our final implementation uses some traditional and some novel mitigation strategies:
  1. Warm starting: starting with the solution from a previous time-step to increase the convergence rate of the iterative solver
  2. Post-stabilization: reprojecting the system back to the constraint manifold to prevent constraint drift
  3. Regularization: adding compliance to the constraints ensuring a solution exists and is unique
  4. Pre-conditioning: using an exact solution to a linear subsystem, improving the stability of complex mechanisms
Strategies 1, 2 and 3 are pretty traditional, but 3 has been improved and perfected by us. Also, although 4 is not unheard of, we haven’t seen any practical implementation of it. We use an original factorization method for large sparse constraint matrices and a new efficient way of combining it with the PGS. The resulting implementation is only slightly slower compared to pure PGS but ensures that the linear system coming from equality constraints is solved exactly. Consequently, the equality constraints suffer only from drift coming from the time discretization. Details on our methods are contained in my GDC 2020 presentation. Currently, we are investigating direct methods applied to inequality constraints and collisions.

Getting More Details

Traditionally there are two mathematical models for articulated mechanisms: there are reduced coordinate methods spearheaded by Featherstone, that parametrize the degrees of freedom at each joint, and there are full coordinate methods that use a Lagrangian formulation.
We use the second formulation as it is less restrictive and requires much simpler mathematics and implementation.
The Roblox engine uses analytical methods to compute the dynamic response of constraints, as opposed to penalty methods that were used before. Analytics methods were initially introduced in Baraff 1989, where they are used to treat both equality and non-equality constraints in a consistent manner. Baraff observed that the contact model can be formulated using quadratic programming, and he provided a heuristic solution method (which is not the method we use in our solver).
Instead of using force-based formulation, we use an impulse-based formulation in velocity space, originally introduced by Mirtich-Canny 1995 and further improved by Stewart-Trinkle 1996, which unifies the treatment of different contact types and guarantees the existence of a solution for contacts with friction. At each timestep, the constraints and collisions are maintained by applying instantaneous changes in velocities due to constraint impulses. An excellent explanation of why impulse-based simulation is superior is contained in the GDC presentation of Catto 2014.
The frictionless contacts are modeled using a linear complementarity problem (LCP) as described in Baraff 1994. Friction is added as a non-linear projection onto the friction cone, interleaved with the iterations of the Projected Gauss-Seidel.
The numerical drift that introduces positional errors in the constraints is resolved using a post-stabilization technique using pseudo-velocities introduced by Cline-Pai 2003. It involves solving a second LCP in the position space, which projects the system back to the constraint manifold.
The LCPs are solved using a PGS / Impulse Solver popularized by Catto 2005 (also see Catto 2009). This method is iterative and considers each individual constraints in sequence and resolves it independently. Over many iterations, and in ideal conditions, the system converges to a global solution.
Additionally, high mass ratio issues in equality constraints are ironed out by preconditioning the PGS using the sparse LDL decomposition of the constraint matrix of equality constraints. Dense submatrices of the constraint matrix are sparsified using a method we call Body Splitting. This is similar to the LDL decomposition used in Baraff 1996, but allows more general mechanical systems, and solves the system in constraint space. For more information, you can see my GDC 2020 presentation.
The architecture of our solver follows the idea of Guendelman-Bridson-Fedkiw, where the velocity and position stepping are separated by the constraint resolution. Our time sequencing is:
  1. Advance velocities
  2. Constraint resolution in velocity space and position space
  3. Advance positions
This scheme has the advantage of integrating only valid velocities, and limiting latency in external force application but allowing a small amount of perceived constraint violation due to numerical drift.
An excellent reference for rigid body simulation is the book Erleben 2005 that was recently made freely available. You can find online lectures about physics-based animation, a blog by Nilson Souto on building a physics engine, a very good GDC presentation by Erin Catto on modern solver methods, and forums like the Bullet Physics Forum and GameDev which are excellent places to ask questions.

In Conclusion

The field of game physics simulation presents many interesting problems that are both exciting and challenging. There are opportunities to learn a substantial amount of cool mathematics and physics and to use modern optimizations techniques. It’s an area of game development that tightly marries mathematics, physics and software engineering.
Even if Roblox has a good rigid body physics engine, there are areas where it can be improved and optimized. Also, we are working on exciting new projects like fracturing, deformation, softbody, cloth, aerodynamics and water simulation.
Neither Roblox Corporation nor this blog endorses or supports any company or service. Also, no guarantees or promises are made regarding the accuracy, reliability or completeness of the information contained in this blog.
This blog post was originally published on the Roblox Tech Blog.
© 2020 Roblox Corporation. All Rights Reserved.

Using Clang to Minimize Global Variable Use

July

23, 2020

by RandomTruffle
PRODUCT & TECH
Every non-trivial program has at least some amount of global state, but too much can be a bad thing. In C++ (which constitutes close to 100% of Roblox’s engine code) this global state is initialized before main() and destroyed after returning from main(), and this happens in a mostly non-deterministic order. In addition to leading to confusing startup and shutdown semantics that are difficult to reason about (or change), it can also lead to severe instability.
Roblox code also creates a lot of long-running detached threads (threads which are never joined and just run until they decide to stop, which might be never). These two things together have a very serious negative interaction on shutdown, because long-running threads continue accessing the global state that is being destroyed. This can lead to elevated crash rates, test suite flakiness, and just general instability.
The first step to digging yourself out of a mess like this is to understand the extent of the problem, so in this post I’m going to talk about one technique you can use to gain visibility into your global startup flow. I’m also going to discuss how we are using this to improve stability across the entire Roblox game engine platform by decreasing our use of global variables.

Introducing -finstrument-functions

Nothing excites me more than learning about a new obscure compiler option that I’ve never had a use for before, so I was pretty happy when a colleague pointed me to this option in the Clang Command Line Reference. I’d never used it before, but it sounded very cool. The idea being that if we could get the compiler to tell us every time it entered and exited a function, we could filter this information through a symbolizer of some kind and generate a report of functions that a) occur before main(), and b) are the very first function in the call-stack (indicating it’s a global).
Unfortunately, the documentation basically just tells you that the option exists with no mention of how to use it or if it even actually does what it sounds like it does. There’s also two different options that sound similar to each other (-finstrument-functions and -finstrument-functions-after-inlining), and I still wasn’t entirely sure what the difference was. So I decided to throw up a quick sample on godbolt to see what happened, which you can see here. Note there are two assembly outputs for the same source listing. One uses the first option and the other uses the second option, and we can compare the assembly output to understand the differences. We can gather a few takeaways from this sample:
  1. The compiler is injecting calls to __cyg_profile_func_enter and __cyg_profile_func_exit inside of every function, inline or not.
  2. The only difference between the two options occurs at the call-site of an inline function.
  3. With -finstrument-functions, the instrumentation for the inlined function is inserted at the call-site, whereas with -finstrument-functions-after-inlining we only have instrumentation for the outer function. This means that when using-finstrument-functions-after-inlining you won’t be able to determine which functions are inlined and where.
Of course, this sounds exactly like what the documentation said it did, but sometimes you just need to look under the hood to convince yourself.
To put all of this another way, if we want to know about calls to inline functions in this trace we need to use -finstrument-functions because otherwise their instrumentation is silently removed by the compiler. Sadly, I was never able to get -finstrument-functions to work on a real example. I would always end up with linker errors deep in the Standard C++ Library which I was unable to figure out. My best guess is that inlining is often a heuristic, and this can somehow lead to subtle ODR (one-definition rule) violations when the optimizer makes different inlining decisions from different translation units. Luckily global constructors (which is what we care about) cannot possibly be inlined anyway, so this wasn’t a problem.
I suppose I should also mention that I still got tons of linker errors with -finstrument-functions-after-inlining as well, but I did figure those out. As best as I can tell, this option seems to imply –whole-archive linker semantics. Discussion of –whole-archive is outside the scope of this blog post, but suffice it to say that I fixed it by using linker groups (e.g. -Wl,–start-group and -Wl,–end-group) on the compiler command line. I was a bit surprised that we didn’t get these same linker errors without this option and still don’t totally understand why. If you happen to know why this option would change linker semantics, please let me know in the comments!

Implementing the Callback Hooks

If you’re astute, you may be wondering what in the world __cyg_profile_func_enter and __cyg_profile_func_exit are and why the program is even successfully linking in the first without giving undefined symbol reference errors, since the compiler is apparently trying to call some function we’ve never defined. Luckily, there are some options that allow us to see inside the linker’s algorithm so we can find out where it’s getting this symbol from to begin with. Specifically, -y should tell us how the linker is resolving . We’ll try it with a dummy program first and a symbol that we’ve defined ourselves, then we’ll try it with __cyg_profile_func_enter .
[email protected]:~/src/sandbox$ cat instr.cpp int main() {} [email protected]:~/src/sandbox$ clang++-9 -fuse-ld=lld -Wl,-y -Wl,main instr.cpp /usbin/../lib/gcc/x86_64-linux-gnu/crt1.o: reference to main /tmp/instr-5b6c60.o: definition of main
No surprises here. The C Runtime Library references main(), and our object file defines it. Now let’s see what happens with __cyg_profile_func_enter and -finstrument-functions-after-inlining.
[email protected]:~/src/sandbox$ clang++-9 -fuse-ld=lld -finstrument-functions-after-inlining -Wl,-y -Wl,__cyg_profile_func_enter instr.cpp /tmp/instr-8157b3.o: reference to __cyg_profile_func_enter /lib/x86_64-linux-gnu/libc.so.6: shared definition of __cyg_profile_func_enter
Now, we see that libc provides the definition, and our object file references it. Linking works a bit differently on Unix-y platforms than it does on Windows, but basically this means that if we define this function ourselves in our cpp file, the linker will just automatically prefer it over the shared library version. Working godbolt link without runtime output is here. So now you can kind of see where this is going, however there are still a couple of problems left to solve.
  1. We don’t want to do this for a full run of the program. We want to stop as soon as we reach main.
  2. We need a way to symbolize this trace.
The first problem is easy to solve. All we need to do is compare the address of the function being called to the address of main, and set a flag indicating we should stop tracing henceforth. (Note that taking the address of main is undefined behavior[1], but for our purposes it gets the job done, and we aren’t shipping this code, so ¯\_(ツ)_/¯). The second problem probably deserves a little more discussion though.

Symbolizing the Traces

In order to symbolize these traces, we need two things. First, we need to store the trace somewhere on persistent storage. We can’t expect to symbolize in real time with any kind of reasonable performance. You can write some C code to save the trace to some magic filename, or you can do what I did and just write it to stderr (this way you can pipe stderr to some file when you run it).
Second, and perhaps more importantly, for every address we need to write out the full path to the module the address belongs to. Your program loads many shared libraries, and in order to translate an address into a symbol, we have to know which shared library or executable the address actually belongs to. In addition, we have to be careful to write out the address of the symbol in the file on disk. When your program is running, the operating system could have loaded it anywhere in memory. And if we’re going to symbolize it after the fact we need to make sure we can still reference it after the information about where it was loaded in memory is lost. The linux function dladdr() gives us both pieces of information we need. A working godbolt sample with the exact implementation of our instrumentation hooks as they appear in our codebase can be found here.

Putting it All Together

Now that we have a file in this format saved on disk, all we need to do is symbolize the addresses. addr2line is one option, but I went with llvm-symbolizer as I find it more robust. I wrote a Python script to parse the file and symbolize each address, then print it in the same “visual” hierarchical format that the original output file is in. There are various options for filtering the resulting symbol list so that you can clean up the output to include only things that are interesting for your case. For example, I filtered out any globals that have boost:: in their name, because I can’t exactly go rewrite boost to not use global variables.
The script isn’t as simple as you would think, because simply crawling each line and symbolizing it would be unacceptably slow (when I tried this, it took over 2 hours before I finally killed the process). This is because the same address might appear thousands of times, and there’s no reason to run llvm-symbolizer against the same address multiple times. So there’s a lot of smarts in there to pre-process the address list and eliminate duplicates. I won’t discuss the implementation in more detail because it isn’t super interesting. But I’ll do even better and provide the source!
So after all of this, we can run any one of our internal targets to get the call tree, run it through the script, and then get output like this (actual output from a Roblox process, source file information removed):
excluded_symbols = [‘.\boost.*’]* excluded_modules = [‘/usr.\’]* /uslib/x86_64-linux-gnu/libLLVM-9.so.1: 140 unique addresses InterestingRobloxProcess: 38928 unique addresses /uslib/x86_64-linux-gnu/libstdc++.so.6: 1 unique addresses /uslib/x86_64-linux-gnu/libc++.so.1: 3 unique addresses Printing call tree with depth 2 for 29276 global variables. __cxx_global_var_init.5 (InterestingFile1.cpp:418:22) RBX::InterestingRobloxClass2::InterestingRobloxClass2() (InterestingFile2.cpp.:415:0) __cxx_global_var_init.19 (InterestingFile2.cpp:183:34) (anonymous namespace)::InterestingRobloxClass2::InterestingRobloxClass2() (InterestingFile2.cpp:171:0) __cxx_global_var_init.274 (InterestingFile3.cpp:2364:33) RBX::InterestingRobloxClass3::InterestingRobloxClass3()
So there you have it: the first half of the battle is over. I can run this script on every platform, compare results to understand what order our globals are actually initialized in in practice, then slowly migrate this code out of global initializers and into main where it can be deterministic and explicit.

Future Work

It occurred to me sometime after implementing this that we could make a general purpose profiling hook that exposed some public symbols (dllexport’ed if you speak Windows), and allowed a plugin module to hook into this dynamically. This plugin module could filter addresses using whatever arbitrary logic that it was interested in. One interesting use case I came up for this is that it could look up the debug information, check if the current address maps to the constructor of a function local static, and write out the address if so. This effectively allows us to gain a deeper understanding of the order in which our lazy statics are initialized. The possibilities are endless here.

Further Reading

If you’re interested in this kind of thing, I’ve collected a couple of my favorite references for this kind of topic.
  1. Various: The C++ Language Standard
  2. Matt Godbolt: The Bits Between the Bits: How We Get to main()
  3. Ryan O’Neill: Learning Linux Binary Analysis
  4. Linkers and Loaders: John R. Levine
  5. https://eel.is/c++draft/basic.exec#basic.start.main-3
Neither Roblox Corporation nor this blog endorses or supports any company or service. Also, no guarantees or promises are made regarding the accuracy, reliability or completeness of the information contained in this blog.
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Binary Options Review; Best Binary Options Brokers

Binary Options Review; Best Binary Options Brokers

Binary Options Review; Best Binary Options Brokers
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submitted by Babyelijah to u/Babyelijah [link] [comments]

System Programming Language Ideas

I am an embedded electronics guy who has several years of experience in the industry, mainly with writing embedded software in C at the high level and the low level. My goal is to start fresh with some projects in terms of software platforms, so I have been looking at whether to use existing programming languages. I want my electronics / software to be open, but therein lies part of the problem. I have experience using and evaluating many compilers during my experience such as the proprietary stuff (IAR) and open source stuff (clang , gcc, etc.). I have nothing against the open source stuff; however, the companies I have worked for (and I) always come crawling back to IAR. Why? Its not a matter of the compiler believe it or not! Its a matter of the linker.
I took a cursory look at the latest gnu / clang linkers and I do not think that have fixed the major issue we always had with these linkers: memory flood fill. Specifying where each object or section is in the memory is fine for small projects or very small teams (1 to 2 people). However, when you have a bigger team (> 2) and you are using microcontrollers with segmented memory (all memory blocks are not contiguous), memory flood fill becomes a requirement of the linker. Often is the case that the MCUs I and others work on do not have megabytes of memory, but kilobytes. The MCU is chosen for the project and if we are lucky to get one with lots of memory, then you know why such a chip was chosen - there is a large memory requirement in the software.. we would not choose a large memory part if we did not need it due to cost. Imagine a developer is writing a library or piece of code whose memory requirement is going to change by single or tens kilobytes each (added or subtracted) commit. Now imagine having to have this developer manually manage the linker script for their particular dev station each time to make sure the linker doesn't cough based on what everybody else has put it in there. On top of that, they need to manually manage the script if it needs to be changed when they commit and hope that nobody else needed to change it as well for whatever they were developing. For even a small amount of developers, manually managing the script has way too many moving parts to be efficient. Memory flood fill solves this problem. IAR (in addition to a few other linkers like Segger's) allow me to just say: "Here are the ten memory blocks on the device. I have a .text section. You figure out how to spread out all the data across those blocks." No manual script modifications required by each developer for their current dev or requirement to sync at the end when committing. It just works.
Now.. what's the next problem? I don't want to use IAR (or Segger)! Why? If my stuff is going to be open to the public on my repositories.. don't you think it sends the wrong message if I say: "Well, here is the source code everybody! But Oh sorry, you need to get a seat of IAR if you want to build it the way I am or figure out how to build it yourself with your own tool chain". In addition, let's say that we go with Segger's free stuff to get by the linker problem. Well, what if I want to make a sellable product based on the open software? Still need to buy a seat, because Segger only allows non commercial usage of their free stuff. This leaves me with using an open compiler.
To me, memory flood fill for the linker is a requirement. I will not use a C tool chain that does not have this feature. My compiler options are clang, gcc, etc. I can either implement a linker script generator or a linker itself. Since I do not need to support dynamic link libraries or any complicated virtual memory stuff in the linker, I think implementing a linker is easily doable. The linker script generator is the simple option, but its a hack and therefore I would not want to partake in it. Basically before the linker (LD / LLD) is invoked, I would go into all the object files and analyze all of their memory requirements and generate a linker script that implements the flood fill as a pre step. Breaking open ELF files and analyzing them is pretty easy - I have done it in the past. The pre step would have my own linker script format that includes provisions for memory flood fill. Since this is like invoking the linker twice.. its a hack and speed detriment for something that I think should have been a feature of LD / LLD decades ago. "Everybody is using gnu / clang with LD / LLD! Why do you think you need flood fill?" To that I respond with: "People who are using gnu / clang and LD / LLD are either on small teams (embedded) OR they are working with systems that have contiguous memory and don't have to worry about segmented memory. Case and point Phones, Laptops, Desktops, anything with external RAM" Pick one reason. I am sure there are other reasons beyond those two in which segmented memory is not an issue. Maybe the segmented memory blocks are so large that you can ignore most of them for one program - early Visual GDB had this issue.. you would go into the linker scripts to find that for chips like the old NXP 4000 series that they were only choosing a single RAM block for data memory because of the linker limitation. This actually horrendously turned off my company from using gnu / clang at the time. In embedded systems where MCUs are chosen based on cost, the amount of memory is specifically chosen to meet that cost. You can't just "ignore" a memory block due to linker limitations. This would require either to buy a different chip or more expensive chip that meets the memory requirements.
ANYWAYS.. long winded prelude to what has led me to looking at making my own programming language. TLDR: I want my software to be open.. I want people to be able to easily build it without shelling out an arm and a leg, and I am a person who is not fond of hacks because of, what I believe, are oversights in the design of existing software.
Why not use Rust, Nim, Go, Zig, any of those languages? No. Period. No. I work with small embedded systems running with small memory microcontrollers as well as a massive number of other companies / developers. Small embedded systems are what make most of the world turn. I want a systems programming language that is as simple as C with certain modern developer "niceties". This does not mean adding the kitchen sink.. generics, closures, classes ................ 50 other things because the rest of the software industry has been using these for years on higher level languages. It is my opinion that the reason that nothing has (or will) displace C in the past, present, or near future is because C is stupid simple. Its basically structures, functions, and pointers... that's it! Does it have its problems? Sure! However, at the end of the day developers can pick up a C program and go without a huge hassle. Why can't we have a language that sticks to this small subset or "core" functionality instead of trying to add the kitchen sink with all these features of other languages? Just give me my functions and structures, and iterate on that. Let's fix some of the developer productivity issues while we are at it.. and no I don't mean by adding generics and classes. I mean more of getting rid of header files and allowing CTFE. "D is what you want." No.. no it's not. That is a prime example of kitchen sink and the kitchen sink of 50 large corporations across the the block.
What are the problems I think need to be solved in a C replacement?
  1. Header files.
  2. Implementation hiding. Don't know the size of that structure without having to manually manage the size of that structure in a header or exposing all the fields of that structure in a header. Every change of the library containing that structure causes a recompile all the way up the chain on all dependencies.
  3. CTFE (compile time function execution). I want to be able to assign type safe constants to things on initialization.
  4. Pointers replaced with references? I am on the fence with this one. I love the power of pointers, but I realize after research where the industry is trying to go.
These are the things I think that need to be solved. Make my life easier as a developer, but also give me something as stupid simple as C.
I have some ideas of how to solve some of these problems. Disclaimer: some things may be hypocritical based on the prelude discussion; however, as often is the case, not 'every' discussion point is black and white.

  1. Header Files
Replace with a module / package system. There exists a project folder wherein there lies a .build script. The compiler runs the build script and builds the project. Building is part of the language / compiler, but dependency and versioning is not. People will be on both sides of the camp.. for or against this. However, it appears that most module type languages require specifying all of the input files up front instead of being able to "dumb compile" like C / C++ due to the fact that all source files are "truly" dumbly independent. Such a module build system would be harder to make parallel due to module dependencies; however, in total, required build "computation" (not necessarily time) is less. This is because the compiler knows everything up front that makes a library and doesn't have to spawn a million processes (each taking its own time) for each source file.
  1. Implementation hiding
What if it was possible to make a custom library format for the language? Libraries use this custom format and contain "deferrals" for a lot of things that need to be resolved. During packaging time, the final output stage, link time, whatever you want to call it (the executable output), the build tool resolves all of the deferrals because it now knows all parts of input "source" objects. What this means is that the last stage of the build process will most likely take the longest because it is also the stage that generates the code.
What is a deferral? Libraries are built with type information and IR like code for each of the functions. The IR code is a representation that can be either executed by interpreter (for CTFE) or converted to binary instructions at the last output stage. A deferral is a node within the library that requires to be resolved at the last stage. Think of it like an unresolved symbol but for mostly constants and structures.
Inside my library A I have a structure that has a bunch of fields. Those fields may be public or private. Another library B wants to derive from that structure. It knows the structure type exists and it has these public fields. The library can make usage of those public fields. Now at the link stage the size of the structure and all derivative structures and fields are resolved. A year down the road library A changes to add a private field to the structure. Library B doesn't care as long as the type name of the structure or its public members that it is using are not changed. Pull in the new library into the link stage and everything is resolved at that time.
I am an advocate for just having plain old C structures but having the ability to "derive" sub structures. Structures would act the same exact way as in C. Let's say you have one structure and then in a second structure you put the first field as the "base" field. This is what I want to have the ability to do in a language.. but built in support for it through derivation and implementation hiding. Memory layout would be exactly like in C. The structures are not classes or anything else.
I have an array of I2C ports in a library; however, I have no idea how many I2C ports there should be until link time. What to do!? I define a deferred constant for the size of the array that needs to be resolved at link time. At link time the build file passes the constant into the library. Or it gets passed as a command line argument.
What this also allows me to do is to provide a single library that can be built using any architecture at link time.
  1. CTFE
Having safe type checked ways to define constants or whatever, filled in by the compiler, I think is a very good mechanism. Since all of the code in libraries is some sort of IR, it can be interpreted at link time to fill in all the blanks. The compiler would have a massive emphasis on analyzing which things are constants in the source code and can be filled in at link time.
There would exist "conditional compilation" in that all of the code exists in the library; however, at link time the conditional compilation is evaluated and only the areas that are "true" are included in the final output.
  1. Pointers & References & Type safety
I like pointers, but I can see the industry trend to move away from them in newer languages. Newer languages seem to kneecap them compared to what you can do in C. I have an idea of a potential fix.
Pointers or some way is needed to be able to access hardware registers. What if the language had support for references and pointers, but pointers are limited to constants that are filled in by the build system? For example, I know hardware registers A, B, and C are at these locations (maybe filled in by CTFE) so I can declare them as constants. Their values can never be changed at runtime; however, what a pointer does is indicate to the compiler to access a piece of memory using indirection.
There would be no way to convert a pointer to a reference or vise versa. There is no way to assign a pointer to a different value or have it point anything that exists (variables, byte arrays, etc..). Then how do we perform a UART write with a block of data? I said there would be no way to convert a reference ( a byte array for example) to a pointer, but I did not say you could not take the address of a reference! I can take the address of a reference (which points to a block of variable memory) and convert to it to an integer. You can perform any math you want with that integer but you can't actually convert that integer back into a reference! As far as the compiler is concerned, the address of a reference is just integer data. Now I can pass that integer into a module that contains a pointer and write data to memory using indirection.
As far as the compiler is concerned, pointers are just a way to tell the compiler to indirectly read and write memory. It would treat pointers as a way to read and write integer data to memory by using indirection. There exists no mechanism to convert a pointer to a reference. Since pointers are essentially constants, and we have deferrals and CTFE, the compiler knows what all those pointers are and where they point to. Therefore it can assure that no variables are ever in a "pointed to range". Additionally, for functions that use pointers - let's say I have a block of memory where you write to each 1K boundary and it acts as a FIFO - the compiler could check to make sure you are not performing any funny business by trying to write outside a range of memory.
What are references? References are variables that consist of say 8 bytes of data. The first 4 bytes are an address and the next 4 bytes is type information. There exists a reference type (any) that be used for assigning any type to it (think void*). The compiler will determine if casts are safe via the type information and for casts it can't determine at build time, it will insert code to check the cast using the type information.
Functions would take parameters as ByVal or ByRef. For example DoSomething(ByRef ref uint8 val, uint8 val2, uint8[] arr). The first parameter is passing by reference a reference to a uint8 (think double pointer). Assigning to val assigns to the reference. The second parameter is passed by value. The third parameter (array type) is passed by reference implicitly.
  1. Other Notes
This is not an exhaustive list of all features I am thinking of. For example visibility modifiers - public, private, module for variables, constants, and functions. Additionally, things could have attributes like in C# to tell the compiler what to do with a function or structure. For example, a structure or field could have a volatile attribute.
I want integration into the language for inline assembly for the architecture. So you could place a function attribute like [Assembly(armv7)]. This could tell the compiler that the function is all armv7 assembly and the compiler will verify it. Having assembly integrated also allows all the language features to be available to the assembly like constants. Does this go against having an IR representation of the library? No. functions have weak or strong linkage. Additionally, there could be a function attribute to tell the compiler: "Hey when the link stage is using an armv7 target, build this function in". There could also be a mechanism for inline assembly and intrinsics.
Please keep in mind that my hope is not to see another C systems language for larger systems (desktop, phones, laptops, etc.) Its solely to see it for small embedded systems and microcontrollers. I think this is why many of the newer languages (Go, Nim, Zig, etc..) have not been adopted in embedded - they started large and certain things were tacked on to "maybe" support smaller devices. I also don't want to have a runtime with my embedded microcontroller; however, I am not averse to the compiler putting bounds checks and casting checks into the assembly when it needs to. For example, if a cast fails, the compiler could just trap in a "hook" defined by the user that includes the module and line number of where the cast failed. It doesn't even matter that the system hangs or locks up as long as I know where to look to fix the bug. I can't tell you how many times something like this would be invaluable for debugging. In embedded, many of us say that its better for the system to crash hard than limp along because of an array out of bounds or whatever. Maybe it would be possible to restart the system in the event of such a crash or do "something" (like for a cruise missile :)).
This is intended to be a discussion and not so much a religious war or to state I am doing this or that. I just wanted to "blurt out" some stuff I have had on my mind for awhile.
submitted by LostTime77 to ProgrammingLanguages [link] [comments]

more related issues


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in the conversion of old and new systems, the most difficult one is uuuuuuuuuuuuuuu.

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submitted by Amanda2020-jumi to u/Amanda2020-jumi [link] [comments]

Mega Unpopular Opinion: Take-home projects can be great!

Ah, I have been debating whether or not I wanted to write this for a while now, but after seeing a few recent threads with 10-50 comments unanimously hating on take-home projects, I figured I would share my opinion.
Some of you may not read until the end, so let me preface this by saying not all take-home projects are great. I am on your side in that you should not complete a take-home project if any of the following are true:
...

With that being said, I will now move on to why I think take-home projects can be great.
For starters, it weeds out sooooo much of the competition. If you look at some job postings on LinkedIn, they can have 200+ applicants in 24 hours, and that is not even accounting for people who find the job via other means (i.e. other job boards, company website, etc). Thats a lot of applicants. Now, I know better than to assume that this subreddit is representative of the whole software industry, but clearly a take-home project potentially gets candidates TO WEED THEMSELVES OUT. So 200 candidates may have applied, but now you're competing with a significantly smaller percentage of people who actually wanted to take the time and do the take-home project. Your odds are much better now.
Now, I know exactly what you're thinking. You don't want to spend the 8-12 hours it would take to complete this take-home project, and you'd rather spend your time casting your net farther and shotgunning your resume out to more companies, but WHY NOT BOTH? You're the one looking for a job, and you are really not in the position to weed yourself out of potential employment. Some of you people have been on the hunt for a job for months and still won't stoop down to the level of giving a company that much time without being guaranteed another interview / a job. New-flash, doing a project increases your chance of getting a job, just like shotgunning your resume AND you get to practice / show off your programming skills (who knows, maybe mess around a make a project you can put on your GitHub as a sample of your work for other employers to see). On top of this, if you are someone with a lot of free-time - I'm looking at you new grads - and don't have a family/responsibilities that you need to take care of, then you really can't complain about time. Let's face it, instead of doing this project, you're watching Silicon Valley on HBO for the third time "to relax" after a "long day" of filling out the same Workday application forms. Come on, searching for a full time job should be a 40hwk job in and of itself.
My next point is that these take home projects sometimes substitute final/on-site interviews. Yea, those 5 hours interviews where you meet every hiring manager and their mother and get grilled round after round because you can't find the optimal solution for sorting a reverse binary search tree that is upside down, flipped, and cooked well done while someone is staring at you, asking questions, and forbidding you from using any resources you would have at your disposable in (almost) any given real world scenario. Yea, those are the real stress-inducing woes of the software interview process, and I would think people would want to avoid those at all costs. Anecdotally, the company that I started working for 3 months ago gave me the choice of a 4 1/2 zoom interview consisting of 4 one hour technical interviews with different hiring managers, or a take-home project that would take 6-10 hours with a 1 1/2 hour follow up discussing my project. The decision was so obvious - stress study an entire week before the interview (hint, this alone probably would take up more time than the take-home project, but on the other hand does prepare you for future interviews) and then endure the torture that is 4+ hours on a zoom call / in an office coding on a whiteboard, or spend about 1-2 hours a day for a week, with access to all resources, leisurely coding up a project, that if done correctly, increases your chance of getting a job astronomically. Not to mention, this option is becoming much more popular with COVID and WFH and the lack of being able to get candidates into the office.

All in all, I really wish more companies offered take-home projects as at least an option for their interview process. In my opinion, they are more informative for both parties, as it represents the work you will be doing if you were to get the job, and it is indicative of the level of effort and knowledge you possess in context of the position they are seeking to fill. I really wish everyone on here would stop spreading their hatred for take-home projects, especially to new grads who have never even done them. And for the love of god stop saying to bill the company for making you do a take-home project, that is just the silliest thing I have ever heard, and I DOUBT any company ever would reply to that kind of an invoice. If you really have that much adversity to them, just don't bother.

TL;DR: I believe some take-home projects are worth doing ¯\_(ツ)_/¯
submitted by Kixstander to cscareerquestions [link] [comments]

Ambrosia and Registration

Now that Ambrosia is gone, new registrations are no longer possible, and due to their expiring codes, using legitimate license keys has become difficult. We may hope to see a few of their games revived in the future but at present, only the original releases are available. Perhaps this case study on Ambrosia's registration algorithms will be useful to some.

The Old System

In their earliest days, ASW didn't require registration, but they eventually began locking core features away behind codes. All of their classic titles use the original algorithm by Andrew Welch.
Given a licensee name, number of copies, and game name, the code generator runs through two loops. The first loop iterates over each letter of the capitalized licensee name, adding the ASCII representation of that letter with the number of copies and then rotating the resulting bits. The second loop repeats that operation, only using the game's name instead of the license holder's name.
Beginning with Mars Rising, later games added a step to these loops: XOR the current code with the common hex string $DEADBEEF. However, the rest of the algorithm remained essentially unchanged.
The resulting 32 bits are converted into a text registration code by adding the ASCII offset of $41 to each hex digit. This maps the 32-bit string into 8 characters, but due to the limit of a hex digit to only encode 16 values, codes only contain letters from the first 16 of the alphabet.
The following chart shows an example using a well-known hacked code for Slithereens.
 Iteration 1 ('A' in ANONYMOUS) Name: Anonymous Code = $0 + $41 Number: 100 (hex: $64) -> << 6 ... -> Code = $FD53 FFA0 Game: Slithereens + $64 ^ $DEAD BEEF >> 1 Add $41 to each digit: Registration -> $41 + $F = $50 = P -> Reverse string -> ------------ $41 + $D = $4E = N | AKPPDFNP | ... ------------ 
Here is a Python implementation of the v1 system: aswreg_v1.py
Once you have the bitstring module installed via sudo pip install bitstring, you can test the output yourself with python aswreg_v1.py "Anonymous" 100 "Slithereens".

The New System

As Ambrosia's Matt Slot explains, the old system continued to allow a lot of piracy, so in the early 2000's they decided to switch to a more challenging registration system. This new method was based on polynomial hashing and included a timestamp so that codes could be expired and renewed. Ambrosia now had better control over code distribution, but they assumed their renewal server would never be shut down...
They also took more aggressive steps to reduce key sharing. The registration app checks against a list of blacklisted codes, and if found to be using one, the number of licenses is internally perturbed so that subsequent calculations fail. To combat tampering, your own information can get locally blacklisted in a similar manner if too many failed attempts occur, at least until the license file is deleted. Furthermore, the app attempts to verify the system time via a remote time server to minimize registration by changing the computer's clock.
You can disable the internet connection, set the clock back, and enter codes. There's also a renewal bot for EV: Nova. But let us look at the algorithm more closely.

64-bit Codes

The first noticeable difference is that registration codes in v2 are now 12 digits, containing both letters and numbers. This is due to a move from a 32-bit internal code to a 64-bit one. Rather than add an ASCII offset to hex digits, every letter or number in a new registration code has a direct mapping to a chunk of 5 bits. Using 5 bits per digit supports up to 32 values, or almost all letters of the alphabet and digits up to 9 (O, I, 0, and 1 were excluded given their visual similarities).
The resulting 64 bits (really only 60 because the upper 4 are unused: 12 digits * 5 bits each = 60) are a combination of two other hashes XOR'd together. This is a notable change from v1 because it only used the registration code to verify against the hashing algorithm. Only the licensee name, number of copies, and game name were really used. In v2, the registration code is itself a hash which contains important information like a code's timestamp.

Two Hashes

To extract such information from the registration code, we must reverse the XOR operation and split out the two hashes which were combined. Fortunately, XOR is reversible, and we can compute one of the hashes. The first hash, which I'll call the userkey, is actually quite similar to v1's algorithm. It loops through the licensee name, adding the ASCII value, number of copies, and shifting bits. This is repeated with the game name. An important change is including multiplication by a factor based on the string size.
The second hash, which I'll call the basekey, is the secret sauce of v2; it's what you pay Ambrosia to generate when registering a product. It is not computed by the registration app, but there are several properties by which it must be validated.
The chart below visualizes the relationships among the various hashes, using the well-known "Barbara Kloeppel" code for EV: Nova.
 TEXTCODE: ------------------ | L4B5-9HJ5-P3NB | ------------------ HASH1 (userkey): | calculated from licensee name, | copies, and game name BINCODE: ---------------------- 5 bits per character, /-> | 0x0902f8932acce305 | plus factors & rotation / ---------------------- ---------------------- / | 0x0008ecc1c2ee5e00 | <-- XOR ---------------------- \ \ ---------------------- \-> | 0x090a1452e822bd05 | ---------------------- HASH2 (basekey): generated by Ambrosia, extracted via XOR 

The Basekey

The basekey is where we must handle timestamps and several validation checks. Consider the binary representation of the sample 0x090a1452e822bd05:
binary basekey (above) and indices for reference (below): 0000 1001 0000 1010 0001 0100 0101 0010 1110 1000 0010 0010 1011 1101 0000 0101 b0 b3 b7 b11 b15 b19 b23 b27 b31 b35 b39 b43 b47 b51 b55 b59 b63 

Timestamps

Timestamp are encoded as a single byte comprised of bits indexed at b56,51,42,37,28,23,14,9 from the basekey. In this example, the timestamp is 01100010 or 0x62 or 98.
The timestamp represents the number of fortnights that have passed since Christmas Day, 2000 Eastern time, modulo 256 to fit in one byte. For example, 98 fortnights places the code at approximately October 2004.
Stored as a single byte, there are 256 unique timestamps. This is 512 weeks or about 10 years. Yes, this means that a code's validity rotates approximately once every decade.
After the code's timestamp is read, it is subtracted from the current timestamp (generated from the system clock or network time server if available). The difference must be less than 2, so codes are valid for 4 weeks or about a month at a time.
Of note, Pillars of Garendall has a bug in which the modulo is not taken correctly, so the timestamp corresponding to 0xFF is valid without expiry.

Validity Check

The last three bits, b60-63, contain the sum of all other 3-bit chunks in the basekey, modulo 7. Without the correct number in these bits, the result will be considered invalid.
To this point, we have covered sufficient material to renew licenses. The timestamp can be changed, the last three bits updated, the result XOR'd with the userkey, and finally, the code converted from binary to text.

Factors for Basekey Generation

I was next curious about code generation. For the purposes of this write-up, I have not fully reverse engineered the basekey, only duplicated the aspects which are used for validation. This yields functional keys, just not genuine ones. If the authors of the EV: Nova renewal bot have fully reversed the algorithm, perhaps they will one day share the steps to genuine basekey creation.
One aspect validated by the registration app is that the licensee name, number, and game name can be modified to yield a set of base factors. These are then multiplied by some number and written into the basekey. We do not need the whole algorithm; we simply must check that the corresponding regions in the basekey are multiples of the appropriate factors.
The regions of note in the basekey are f1 = b5-9,47-51,33-37,19-23, f2 = b43-47,29-33,15-19,57-61, and f3 = b24-28,10-14,52-56,38-42. The top 5 bits and f3 are never actually checked, so they can be ignored.
Considering f1 and f2, the values in the sample basekey are 0x25DA and 0x1500, respectively. The base factors are 0x26 and 0x1C, which are multiples by 0xFF and 0xC0, respectively.
Rather than analyze the code in detail, I wrote a small script to translate over the disassembled PPC to Python wholesale. It is sufficient for generating keys to EV: Nova, using the perfectly-valid multiple of 1x, but I have found it fails for other v2 products.

Scripts

Here is a Python implementation for v2: aswreg_v2.py and aswreg_v2core.py
With bitstring installed, you can renew codes like python aswreg_v2.py renew "L4B5-9HJ5-P3NB" "Barbara Kloeppel" 1 "EV Nova" (just sample syntax, blacklisted codes will still fail in the app). There's also a function to check a code's timestamp with date or create a new license with generate.
As earlier cautioned, generating basekeys relies on code copied from disassembled PPC and will likely not work outside EV: Nova. In my tests with other v2 products, all essential parts of the algorithm remain the same, even the regions of the basekey which are checked as multiples of the factors. What differs is the actual calculation of base factors. Recall that these keys were created by Ambrosia outside the local registration system, so the only options are to copy the necessary chunks of code to make passable factors for each product or to fully reverse engineer the basekey algorithm. I've no doubt the factors are an easy computation once you know the algorithm, but code generation becomes less critical when renewal is an option for other games. I leave it to the authors of the Zeus renewal bot if they know how to find these factors more generally.
To renew codes for other games, keep in mind the name must be correct. For instance, Pillars of Garendall is called "Garendall" internally. You can find a game's name by typing a gibberish license in the registration app and seeing what file is created in Preferences. It should be of the form License.
Finally, a couple disclaimers: I have only tested with a handful of keys, so my interpretations and implementations may not be completely correct. YMMV. Furthermore, these code snippets are posted as an interesting case study about how a defunct company once chose to combat software piracy, not to promote piracy. Had Ambrosia remained operational, I'm sure we would have seen a v3 registration system or a move to online-based play as so many other games are doing today, but I hope this has been helpful for those who still wish to revisit their favorite Ambrosia classics.
submitted by asw_anon to evnova [link] [comments]

Part 2: Tools & Info for Sysadmins - Mega List of Tips, Tools, Books, Blogs & More

(continued from part 1)
Unlocker is a tool to help delete those irritating locked files that give you an error message like "cannot delete file" or "access is denied." It helps with killing processes, unloading DLLs, deleting index.dat files, as well as unlocking, deleting, renaming, and moving locked files—typically without requiring a reboot.
IIS Crypto's newest version adds advanced settings; registry backup; new, simpler templates; support for Windows Server 2019 and more. This tool lets you enable or disable protocols, ciphers, hashes and key exchange algorithms on Windows and reorder SSL/TLS cipher suites from IIS, change advanced settings, implement best practices with a single click, create custom templates and test your website. Available in both command line and GUI versions.
RocketDock is an application launcher with a clean interface that lets you drag/drop shortcuts for easy access and minimize windows to the dock. Features running application indicators, multi-monitor support, alpha-blended PNG and ICO icons, auto-hide and popup on mouse over, positioning and layering options. Fully customizable, portable, and compatible with MobyDock, ObjectDock, RK Launcher and Y'z Dock skins. Works even on slower computers and is Unicode compliant. Suggested by lieutenantcigarette: "If you like the dock on MacOS but prefer to use Windows, RocketDock has you covered. A superb and highly customisable dock that you can add your favourites to for easy and elegant access."
Baby FTP Server offers only the basics, but with the power to serve as a foundation for a more-complex server. Features include multi-threading, a real-time server log, support for PASV and non-PASV mode, ability to set permissions for download/upload/rename/delete/create directory. Only allows anonymous connections. Our thanks to FatherPrax for suggesting this one.
Strace is a Linux diagnostic, debugging and instructional userspace tool with a traditional command-line interface. Uses the ptrace kernel feature to monitor and tamper with interactions between processes and the kernel, including system calls, signal deliveries and changes of process state.
exa is a small, fast replacement for ls with more features and better defaults. It uses colors to distinguish file types and metadata, and it recognizes symlinks, extended attributes and Git. All in one single binary. phils_lab describes it as "'ls' on steroids, written in Rust."
rsync is a faster file transfer program for Unix to bring remote files into sync. It sends just the differences in the files across the link, without requiring both sets of files to be present at one of the ends. Suggested by zorinlynx, who adds that "rsync is GODLY for moving data around efficiently. And if an rsync is interrupted, just run it again."
Matter Wiki is a simple WYSIWYG wiki that can help teams store and collaborate. Every article gets filed under a topic, transparently, so you can tell who made what changes to which document and when. Thanks to bciar-iwdc for the recommendation.
LockHunter is a file unlocking tool that enables you to delete files that are being blocked for unknown reasons. Can be useful for fighting malware and other programs that are causing trouble. Deletes files into the recycle bin so you can restore them if necessary. Chucky2401 finds it preferable to Unlocker, "since I am on Windows 7. There are no new updates since July 2017, but the last beta was in June of this year."
aria2 is a lightweight multi-source command-line download utility that supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink. It can be manipulated via built-in JSON-RPC and XML-RPC interfaces. Recommended by jftuga, who appreciates it as a "cross-platform command line downloader (similar to wget or curl), but with the -x option can run a segmented download of a single file to increase throughput."
Free Services
Temp-Mail allows you to receive email at a temporary address that self-destructs after a certain period of time. Outwit all the forums, Wi-Fi owners, websites and blogs that insist you register to use them. Petti-The-Yeti says, "I don't give any company my direct email anymore. If I want to trial something but they ask for an email signup, I just grab a temporary email from here, sign up with it, and wait for the trial link or license info to come through. Then, you just download the file and close the website."
Duck DNS will point a DNS (sub domains of duckdns.org) to an IP of your choice. DDNS is a handy way for you to refer to a serverouter with an easily rememberable name for situations when the server's ip address will likely change. Suggested by xgnarf, who finds it "so much better for the free tier of noip—no 30-day nag to keep your host up."
Joe Sandbox detects and analyzes potential malicious files and URLs on Windows, Android, Mac OS, Linux and iOS for suspicious activities. It performs deep malware analysis and generates comprehensive and detailed reports. The Community Edition of Joe Sandbox Cloud allows you to run a maximum of 6 analyses per month, 3 per day on Windows, Linux and Android with limited analysis output. This one is from dangibbons94, who wanted to "share this cool service ... for malware analysis. I usually use Virus total for URL scanning, but this goes a lot more in depth. I just used basic analysis, which is free and enough for my needs."
Hybrid Analysis is a malware analysis service that detects and analyzes unknown threats for the community. This one was suggested by compupheonix, who adds that it "gets you super detailed reports... it's about the most fleshed out and detailed one I can find."
JustBeamIt is a file-transfer service that allows you to send files of any size via a peer-to-peer streaming model. Simply drag and drop your file and specify the recipient's email address. They will then receive a link that will trigger the download directly from your computer, so the file does not have to be uploaded to the service itself. The link is good for one download and expires after 10 minutes. Thanks to cooljacob204sfw for the recommendation!
ShieldsUP is a quick but powerful internet security checkup and information service. It was created by security researcher Steve Gibson to scan ports and let you know which ones have been opened through your firewalls or NAT routers.
Firefox Send is an encrypted file transfer service that allows you to share files up to 2.5GB from any browser or an Android app. Uses end-to-end encryption to keep data secure and offers security controls you can set. You can determine when your file link expires, the number of downloads, and whether to add a password. Your recipient receives a link to download the file, and they don’t need a Firefox account. This one comes from DePingus, who appreciates the focus on privacy. "They have E2E, expiring links, and a clear privacy policy."
Free DNS is a service where programmers share domain names with one another at no cost. Offers free hosting as well as dynamic DNS, static DNS, subdomain and domain hosting. They can host your domain's DNS as well as allowing you to register hostnames from domains they're hosting already. If you don't have a domain, you can sign up for a free account and create up to 5 subdomains off the domains others have contributed and point these hosts anywhere on the Internet. Thanks to 0x000000000000004C (yes, that's a username) for the suggestion!
ANY.RUN is an interactive malware analysis service for dynamic and static research of the majority of threats in any environment. It can provide a convenient in-depth analysis of new, unidentified malicious objects and help with the investigation of incidents. ImAshtonTurner appreciates it as "a great sandbox tool for viewing malware, etc."
Plik is a scalable, temporary file upload system similar to wetransfer that is written in golang. Thanks go to I_eat_Narwhals for this one!
Free My IP offers free, dynamic DNS. This service comes with no login, no ads, no newsletters, no links to click and no hassle. Kindly suggested by Jack of All Trades.
Mailinator provides free, temporary email inboxes on a receive-only, attachment-free system that requires no sign-up. All @mailinator.com addresses are public, readable and discoverable by anyone at any time—but are automatically deleted after a few hours. Can be a nice option for times when you to give out an address that won't be accessible longterm. Recommended by nachomountain, who's been using it "for years."
Magic Wormhole is a service for sending files directly with no intermediate upload, no web interface and no login. When both parties are online you with the minimal software installed, the wormhole is invoked via command line identifying the file you want to send. The server then provides a speakable, one-time-use password that you give the recipient. When they enter that password in their wormhole console, key exchange occurs and the download begins directly between your computers. rjohnson99 explains, "Magic Wormhole is sort of like JustBeamIt but is open-source and is built on Python. I use it a lot on Linux servers."
EveryCloud's Free Phish is our own, new Phishing Simulator. Once you've filled in the form and logged in, you can choose from lots of email templates (many of which we've coped from what we see in our Email Security business) and landing pages. Run a one-off free phish, then see who clicked or submitted data so you can understand where your organization is vulnerable and act accordingly.
Hardening Guides
CIS Hardening Guides contain the system security benchmarks developed by a global community of cybersecurity experts. Over 140 configuration guidelines are provided to help safeguard systems against threats. Recommended by cyanghost109 "to get a start on looking at hardening your own systems."
Podcasts
Daily Tech News is Tom Merrit's show covering the latest tech issues with some of the top experts in the field. With the focus on daily tech news and analysis, it's a great way to stay current. Thanks to EmoPolarbear for drawing it to our attention.
This Week in Enterprise Tech is a podcast that features IT experts explaining the complicated details of cutting-edge enterprise technology. Join host Lou Maresca on this informative exploration of enterprise solutions, with new episodes recorded every Friday afternoon.
Security Weekly is a podcast where a "bunch of security nerds" get together and talk shop. Topics are greatly varied, and the atmosphere is relaxed and conversational. The show typically tops out at 2 hours, which is perfect for those with a long commute. If you’re fascinated by discussion of deep technical and security-related topics, this may be a nice addition to your podcast repertoire.
Grumpy Old Geeks—What Went Wrong on the Internet and Who's To Blame is a podcast about the internet, technology and geek culture—among other things. The hosts bring their grumpy brand of humor to the "state of the world as they see it" in these roughly hour-long weekly episodes. Recommended by mkaxsnyder, who enjoys it because, "They are a good team that talk about recent and relevant topics from an IT perspective."
The Social-Engineer Podcast is a monthly discussion among the hosts—a group of security experts from SEORG—and a diverse assortment of guests. Topics focus around human behavior and how it affects information security, with new episodes released on the second Monday of every month. Thanks to MrAshRhodes for the suggestion.
The CyberWire podcasts discuss what's happening in cyberspace, providing news and commentary from industry experts. This cyber security-focused news service delivers concise, accessible, and relevant content without the gossip, sensationalism, and the marketing buzz that often distract from the stories that really matter. Appreciation to supermicromainboard for the suggestion.
Malicious Life is a podcast that tells the fascinating—and often unknown—stories of the wildest hacks you can ever imagine. Host Ran Levi, a cybersecurity expert and author, talks with the people who were actually involved to reveal the history of each event in depth. Our appreciation goes to peraphon for the recommendation.
The Broadcast Storm is a podcast for Cisco networking professionals. BluePieceOfPaper suggests it "for people studying for their CCNA/NP. Kevin Wallace is a CCIE Collaboration so he knows his *ishk. Good format for learning too. Most podcasts are about 8-15 mins long and its 'usually' an exam topic. It will be something like "HSPR" but instead of just explaining it super boring like Ben Stein reading a powerpoint, he usually goes into a story about how (insert time in his career) HSPR would have been super useful..."
Software Engineering Radio is a podcast for developers who are looking for an educational resource with original content that isn't recycled from other venues. Consists of conversations on relevant topics with experts from the software engineering world, with new episodes released three to four times per month. a9JDvXLWHumjaC tells us this is "a solid podcast for devs."
Books
System Center 2012 Configuration Manager is a comprehensive technical guide designed to help you optimize Microsoft's Configuration Manager 2012 according to your requirements and then to deploy and use it successfully. This methodical, step-by-step reference covers: the intentions behind the product and its role in the broader System Center product suite; planning, design, and implementation; and details on each of the most-important feature sets. Learn how to leverage the user-centric capabilities to provide anytime/anywhere services & software, while strengthening control and improving compliance.
Network Warrior: Everything You Need to Know That Wasn’t on the CCNA Exam is a practical guide to network infrastructure. Provides an in-depth view of routers and routing, switching (with Cisco Catalyst and Nexus switches as examples), SOHO VoIP and SOHO wireless access point design and configuration, introduction to IPv6 with configuration examples, telecom technologies in the data-networking world (including T1, DS3, frame relay, and MPLS), security, firewall theory and configuration, ACL and authentication, Quality of Service (QoS), with an emphasis on low-latency queuing (LLQ), IP address allocation, Network Time Protocol (NTP) and device failures.
Beginning the Linux Command Line is your ally in mastering Linux from the keyboard. It is intended for system administrators, software developers, and enthusiastic users who want a guide that will be useful for most distributions—i.e., all items have been checked against Ubuntu, Red Hat and SUSE. Addresses administering users and security and deploying firewalls. Updated to the latest versions of Linux to cover files and directories, including the Btrfs file system and its management and systemd boot procedure and firewall management with firewalld.
Modern Operating Systems, 4th Ed. is written for students taking intro courses on Operating Systems and for those who want an OS reference guide for work. The author, an OS researcher, includes both the latest materials on relevant operating systems as well as current research. The previous edition of Modern Operating Systems received the 2010 McGuffey Longevity Award that recognizes textbooks for excellence over time.
Time Management for System Administrators is a guide for organizing your approach to this challenging role in a way that improves your results. Bestselling author Thomas Limoncelli offers a collection of tips and techniques for navigating the competing goals and concurrent responsibilities that go along with working on large projects while also taking care of individual user's needs. The book focuses on strategies to help with daily tasks that will also allow you to handle the critical situations that inevitably require your attention. You'll learn how to manage interruptions, eliminate time wasters, keep an effective calendar, develop routines and prioritize, stay focused on the task at hand and document/automate to speed processes.
The Practice of System and Network Administration, 3rd Edition introduces beginners to advanced frameworks while serving as a guide to best practices in system administration that is helpful for even the most advanced experts. Organized into four major sections that build from the foundational elements of system administration through improved techniques for upgrades and change management to exploring assorted management topics. Covers the basics and then moves onto the advanced things that can be built on top of those basics to wield real power and execute difficult projects.
Learn Windows PowerShell in a Month of Lunches, Third Edition is designed to teach you PowerShell in a month's worth of 1-hour lessons. This updated edition covers PowerShell features that run on Windows 7, Windows Server 2008 R2 and later, PowerShell v3 and later, and it includes v5 features like PowerShellGet. For PowerShell v3 and up, Windows 7 and Windows Server 2008 R2 and later.
Troubleshooting with the Windows Sysinternals Tools is a guide to the powerful Sysinternals tools for diagnosing and troubleshooting issues. Sysinternals creator Mark Russinovich and Windows expert Aaron Margosis provide a deep understanding of Windows core concepts that aren’t well-documented elsewhere along with details on how to use Sysinternals tools to optimize any Windows system’s reliability, efficiency, performance and security. Includes an explanation of Sysinternals capabilities, details on each major tool, and examples of how the tools can be used to solve real-world cases involving error messages, hangs, sluggishness, malware infections and more.
DNS and BIND, 5th Ed. explains how to work with the Internet's distributed host information database—which is responsible for translating names into addresses, routing mail to its proper destination, and listing phone numbers according to the ENUM standard. Covers BIND 9.3.2 & 8.4.7, the what/how/why of DNS, name servers, MX records, subdividing domains (parenting), DNSSEC, TSIG, troubleshooting and more. PEPCK tells us this is "generally considered the DNS reference book (aside from the RFCs of course!)"
Windows PowerShell in Action, 3rd Ed. is a comprehensive guide to PowerShell. Written by language designer Bruce Payette and MVP Richard Siddaway, this volume gives a great introduction to Powershell, including everyday use cases and detailed examples for more-advanced topics like performance and module architecture. Covers workflows and classes, writing modules and scripts, desired state configuration and programming APIs/pipelines.This edition has been updated for PowerShell v6.
Zero Trust Networks: Building Secure Systems in Untrusted Networks explains the principles behind zero trust architecture, along with what's needed to implement it. Covers the evolution of perimeter-based defenses and how they evolved into the current broken model, case studies of zero trust in production networks on both the client and server side, example configurations for open-source tools that are useful for building a zero trust network and how to migrate from a perimeter-based network to a zero trust network in production. Kindly recommended by jaginfosec.
Tips
Here are a couple handy Windows shortcuts:
Here's a shortcut for a 4-pane explorer in Windows without installing 3rd-party software:
(Keep the win key down for the arrows, and no pauses.) Appreciation goes to ZAFJB for this one.
Our recent tip for a shortcut to get a 4-pane explorer in Windows, triggered this suggestion from SevaraB: "You can do that for an even larger grid of Windows by right-clicking the clock in the taskbar, and clicking 'Show windows side by side' to arrange them neatly. Did this for 4 rows of 6 windows when I had to have a quick 'n' dirty "video wall" of windows monitoring servers at our branches." ZAFJB adds that it actually works when you right-click "anywhere on the taskbar, except application icons or start button."
This tip comes courtesy of shipsass: "When I need to use Windows Explorer but I don't want to take my hands off the keyboard, I press Windows-E to launch Explorer and then Ctrl-L to jump to the address line and type my path. The Ctrl-L trick also works with any web browser, and it's an efficient way of talking less-technical people through instructions when 'browse to [location]' stumps them."
Clear browser history/cookies by pressing CTRL-SHIFT-DELETE on most major browsers. Thanks go to synapticpanda, who adds that this "saves me so much time when troubleshooting web apps where I am playing with the cache and such."
To rename a file with F2, while still editing the name of that file: Hit TAB to tab into the renaming of the next file. Thanks to abeeftaco for this one!
Alt-D is a reliable alternative to Ctrl-L for jumping to the address line in a browser. Thanks for this one go to fencepost_ajm, who explains: "Ctrl-L comes from the browser side as a shortcut for Location, Alt-D from the Windows Explorer side for Directory."
Browser shortcut: When typing a URL that ends with dot com, Ctrl + Enter will place the ".com" and take you to the page. Thanks to wpierre for this one!
This tip comes from anynonus, as something that daily that saves a few clicks: "Running a program with ctrl + shift + enter from start menu will start it as administrator (alt + y will select YES to run as admin) ... my user account is local admin [so] I don't feel like that is unsafe"
Building on our PowerShell resources, we received the following suggestion from halbaradkenafin: aka.ms/pskoans is "a way to learn PowerShell using PowerShell (and Pester). It's really cool and a bunch of folks have high praise for it (including a few teams within MSFT)."
Keyboard shortcut: If you already have an application open, hold ctrl + shift and middle click on the application in your task bar to open another instance as admin. Thanks go to Polymira for this one.
Remote Server Tip: "Critical advice. When testing out network configuration changes, prior to restarting the networking service or rebooting, always create a cron job that will restore your original network configuration and then reboot/restart networking on the machine after 5 minutes. If your config worked, you have enough time to remove it. If it didn't, it will fix itself. This is a beautifully simple solution that I learned from my old mentor at my very first job. I've held on to it for a long time." Thanks go to FrigidNox for the tip!
Websites
Deployment Research is the website of Johan Arwidmark, MS MVP in System Center Cloud and Datacenter Management. It is dedicated to sharing information and guidance around System Center, OS deployment, migration and more. The author shares tips and tricks to help improve the quality of IT Pros’ daily work.
Next of Windows is a website on (mostly) Microsoft-related technology. It's the place where Kent Chen—a computer veteran with many years of field experience—and Jonathan Hu—a web/mobile app developer and self-described "cool geek"—share what they know, what they learn and what they find in the hope of helping others learn and benefit.
High Scalability brings together all the relevant information about building scalable websites in one place. Because building a website with confidence requires a body of knowledge that can be slow to develop, the site focuses on moving visitors along the learning curve at a faster pace.
Information Technology Research Library is a great resource for IT-related research, white papers, reports, case studies, magazines, and eBooks. This library is provided at no charge by TradePub.com. GullibleDetective tells us it offers "free PDF files from a WIIIIIIDE variety of topics, not even just IT. Only caveat: as its a vendor-supported publishing company, you will have to give them a bit of information such as name, email address and possibly a company name. You undoubtedly have the ability to create fake information on this, mind you. The articles range from Excel templates, learning python, powershell, nosql etc. to converged architecture."
SS64 is a web-based reference guide for syntax and examples of the most-common database and OS computing commands. Recommended by Petti-The-Yeti, who adds, "I use this site all the time to look up commands and find examples while I'm building CMD and PS1 scripts."
Phishing and Malware Reporting. This website helps you put a stop to scams by getting fraudulent pages blocked. Easily report phishing webpages so they can be added to blacklists in as little as 15 minutes of your report. "Player024 tells us, "I highly recommend anyone in the industry to bookmark this page...With an average of about 10 minutes of work, I'm usually able to take down the phishing pages we receive thanks to the links posted on that website."
A Slack Channel
Windows Admin Slack is a great drive-by resource for the Windows sysadmin. This team has 33 public channels in total that cover different areas of helpful content on Windows administration.
Blogs
KC's Blog is the place where Microsoft MVP and web developer Kent Chen shares his IT insights and discoveries. The rather large library of posts offer helpful hints, how-tos, resources and news of interest to those in the Windows world.
The Windows Server Daily is the ever-current blog of technologist Katherine Moss, VP of open source & community engagement for StormlightTech. Offers brief daily posts on topics related to Windows server, Windows 10 and Administration.
An Infosec Slideshow
This security training slideshow was created for use during a quarterly infosec class. The content is offered generously by shalafi71, who adds, "Take this as a skeleton and flesh it out on your own. Take an hour or two and research the things I talk about. Tailor this to your own environment and users. Make it relevant to your people. Include corporate stories, include your audience, exclude yourself. This ain't about how smart you are at infosec, and I can't stress this enough, talk about how people can defend themselves. Give them things to look for and action they can take. No one gives a shit about your firewall rules."
Tech Tutorials
Tutorialspoint Library. This large collection of tech tutorials is a great resource for online learning. You'll find nearly 150 high-quality tutorials covering a wide array of languages and topics—from fundamentals to cutting-edge technologies. For example, this Powershell tutorial is designed for those with practical experience handling Windows-based Servers who want to learn how to install and use Windows Server 2012.
The Python Tutorial is a nice introduction to many of Python’s best features, enabling you to read and write Python modules and programs. It offers an understanding of the language's style and prepares you to learn more about the various Python library modules described in 'The Python Standard Library.' Kindly suggested by sharjeelsayed.
SysAdmin Humor
Day in the Life of a SysAdmin Episode 5: Lunch Break is an amusing look at a SysAdmin's attempt to take a brief lunch break. We imagine many of you can relate!
Have a fantastic week and as usual, let me know any comments or suggestions.
u/crispyducks
submitted by crispyducks to sysadmin [link] [comments]

Which are the top computer science websites students must visit?

Computer science is the investigation of PCs and processing ideas. It incorporates both hardware and software, just as network administration and the Internet.
The hardware part of computer science covers with electrical engineering. It includes the essential design of PC and the manner in which they work.
A crucial comprehension of how a PC “computes,” or performs calculations, gives the establishment of understanding further developed ideas. For instance, seeing how a PC works in binary enables you to see how PCs include, subtract, and perform different activities. Finding out about rational doors empowers you to understand processor engineering.
The software side of computer science spreads programming ideas just as specific programming languages. Programming ideas incorporate functions, calculations, and source code plan. Computer science additionally covers compilers, working frameworks, and software applications. Client-centered parts of computer science include PC graphics and user interface plan.
Since almost all PCs are currently associated with the Internet, the computer science umbrella spreads Internet advances also. This incorporates Internet conventions, media communications, and systems administration ideas. It likewise includes viable applications, for example, website design and system organization.

Why pursuing computer science stream?

Table of Contents
The most important part of computer science is critical thinking or problem solving, a fundamental ability forever. Students study the design, improvement, and examination of software and hardware used to tackle issues in an assortment of business, logical, and social settings.
Since PCs take care of issues to serve individuals, there is a huge human side to computer science also.

Reasons to study computer science:

The Association for Computing Machinery (ACM) is a worldwide association for PC researchers. The ACM has built up the accompanying list of some reasons to study computer science which we quote:

The top website which computer science student should visit:

1 Stanford engineering everywhere:

Stanford Engineering Everywhere is a free asset intended to give students over the U.S. with access to a portion of the courses and instruments utilized by Stanford students to ace the basics of computing, artificial intelligence, and electrical engineering.
These materials are additionally accessible to teachers for use in classroom settings and are secured under a Creative Commons permit that guarantees they are uninhibitedly open to anybody with a PC and an Internet association.

2 Tutorials point:

If you have an enthusiasm for computer science and need to upgrade your abilities then tutorials point is the site for you. It’s an extremely famous site which offers extraordinary instructional exercises on a wide assortment of programming languages.
In this way, if you are only a beginner with no sign, at that point this site has every help available for you. It’s the best library will give you more than your expectations. The best part about this site is that it has online ide or you can say a word processor to alter codes, to assemble and run them.

3 W3schools:

The next is w3schools. Numerous specialists state if you need to turn into a fruitful web designer; at that point, there is nothing superior to W3schools. It is the most favored site for learning web advancement over us, and it’s completely free of expense. Even though you can pay for certifications.
The instructional exercises on this site offer tens and several models and references for better learning and experimentation. Likewise, numerous capable web designers were begun with the assistance of this site.
It has a wide scope of instructional exercises on Html, CSS, PHP, javascript, jquery, and a few systems too, for example, bootstrap. Not just that this site likewise has its very own online supervisor, which gives you a chance to attempt code online with no stress of establishment of the word processors independently.

4 Geeks for geeks:

This site is somewhat interesting on our list.
Geeks for Geeks offer programming languages as well as gets ready students who are going for interviews that are identified with computer science employment. The site gives all sort of arrangements extending from easiest to specialized ones.
Like Tutroialspoint and w3schools, it additionally offers you a completely practical idea or word processor which let you alter code all the more effectively. C, Python, and Java are the principal programming languages which are covered in this site.

5 Quora:

It is not a tutorial site. It is utilized to address the inquiries made by the overall population. We can likewise say that it’s fundamentally an inquiry/answer driven site, and you may discover the response to the inquiries identified with your or some other industry.
By this, we imply that it likewise has questions identified with the computer science field, which may enable you to understand your inquiries excellently and proficiently.
The explanation for its fifth position on our list is that it has an enormous network of software engineers and designers which eagerly attempt to address the inquiries made by you or the overall population. As we would see it, if you have any question, at that point you should put it on Quora.
Individuals who have the appropriate response will offer their responses, and you can likewise be able to like, remark or even upvote that answer. A few people additionally state that if you have an inquiry, at that point, Quora it, which demonstrates the intensity of this site.

6 Stackoverflow:

If you need an option that is superior to Quora, at that point StackOverflow will do it for you. This site has the greatest network of software engineers and designers the whole way across the globe. They share their issues and get a versatile arrangement from the accomplished engineers and software engineers who come and answer the issues energetically.
The StackOverflow is an excellent site to the individuals who committed errors in code and not found any answer for their code. It’s an incredibly phenomenal site, which targets computer science points.
So we prescribe you to visit it, in any event, two times each day to exceed expectations in computer science regardless of whether you are a starter or a middle of the road.
Since specialists do that. So if you are writing code and stalled out, put your issue forward on StackOverflow and pause. Before long, somebody from the network will enable you to out in the manner to fix it. It’s as straightforward as that.

7 Youtube:

All things considered, YouTube needs no presentation.
You can learn anything from a place without spending any single coin. This site is the world’s second-biggest web index on the web.
It does not just offer instructional exercises, truth be told, it has billions of recordings on different points too. For example, innovation, motion pictures, games, and so on. In this way, you can likewise utilize it as a wellspring of excitement if you need.
This suggests it as a total bundle to appreciate learning just as fun. Here, you will discover recordings identified with any point. You are running right from antiquated things to advanced science.
YouTube has everything to feature. It is additionally called the second home for makers. It is the greatest stage for instructional exercises too. As indicated by some review, YouTube has the most significant measure of recordings in a computer science theme.
It additionally has every one of the recordings identified with any point, for example, a motion picture, tech audit, programming, and so forth. What’s more, the best part is you can look through your preferred theme, and you will have the consequence of excellent free recordings there.
So good karma with that.

8 JavaTpoint:

While offering a few instructional exercises on programming languages, it additionally provides instructional practices on different issues identified with PC and current innovation.
This is something novel which isn’t offered by some other site yet. The site has instructional exercises on practically all the programming languages, including the most up to date ones also.

Importance of computer science:

Computer science benefits society in numerous ways:

1 Encouraging education:

Would you be able to envision present-day education without PC programming or the web? Regardless of whether you’re taking a web-based class, looking into for a paper or sharing work utilizing the cloud, computer science advantage has helped make this conceivable.
E-learning stages and applications give students new devices to issue solving and study, which has changed the academic world. The capacity to take classes online is additionally a significant advantage for the world—as it makes access to education for students whose areas, functions, or funds were a boundary.

2 Growing communication:

“The greatest role computer science has made is in the field of communication,” computer science has made the entire world a tiny spot—accessible readily available at this point.” Internet-based life, video calling, and chatting applications—even the applications that enable you to share records and photographs with another person long-distance. These limits have altered the workforce.

3 Accelerating healthcare progress:

Human care services will, in general, be a quite high need when you think about how to improve individuals’ lives.
One of the most energizing features of computer science is its capacity to improve and quicken each other field. “Information science and artificial intelligence (AI) as subsets of software engineering enable individuals and associations to quicken and ‘prepackage thought’. Along these lines, software engineering and human-made brainpower can make some other control many, commonly better.”

4 Positively affecting each territory of society:

Computer science makes its presence in every field. Without a computer, there is every work is incomplete. Computer science is a good profession and provides benefits to our society in several ways.

Popular jobs in computer science field:

Web Developer: A web engineer makes and looks after sites. The duties can run from making straightforward sites for eateries to out and out web applications for new companies.
Money Programmer: A money developer manages the always showing signs of change universe of bank transactions. They manage the projects and codes that deal with the large number of dollars a bank may process in multi-day. Being a software engineer for an accounting firm can be a distressing activity; however, the compensation is the reward.
Game Developer: Game engineers make the games that fuel the consistently developing game industry. Regardless of whether it’s for portable game applications or comfort gaming, there is a huge interest for qualified game developers. This field is troublesome, with information about complicated math a need.

Some Computer Science Assignment Help Websites:

These websites are popular for providing assignment help-
Codeavail
Calltutors
JavaAssignmentHelp
Coursementor
Also, read…
How Do I Complete My Programming Assignment In Short Time?
Who can provide highly Professional Programming Assignment Help?
How to get the best cheap Computer Science Homework Help?

Conclusion:

While getting a computer science degree students face difficulties in managing a balance between assignment submission and academic syllabus completion. So our codeavail site provides computer science assignment help whenever you need.
Above discussion made it clear that computer science has great importance in every field. For education purpose, there are several sites available from which a student can get help on their related topics and get help in completion of computer science assignment.
Submit your requirements or queries here now.
submitted by codeavail_expert to computersciencehub [link] [comments]

Vault 7 - CIA Hacking Tools Revealed

Vault 7 - CIA Hacking Tools Revealed
March 07, 2017
from Wikileaks Website


https://preview.redd.it/9ufj63xnfdb41.jpg?width=500&format=pjpg&auto=webp&s=46bbc937f4f060bad1eaac3e0dce732e3d8346ee

Press Release
Today, Tuesday 7 March 2017, WikiLeaks begins its new series of leaks on the U.S. Central Intelligence Agency.
Code-named "Vault 7" by WikiLeaks, it is the largest ever publication of confidential documents on the agency.
The first full part of the series, "Year Zero", comprises 8,761 documents and files from an isolated, high-security network situated inside the CIA's Center for Cyber Intelligence (below image) in Langley, Virgina.
It follows an introductory disclosure last month of CIA targeting French political parties and candidates in the lead up to the 2012 presidential election.
Recently, the CIA lost control of the majority of its hacking arsenal including,
  1. malware
  2. viruses
  3. trojans
  4. weaponized "zero day" exploits
  5. malware remote control systems

...and associated documentation.
This extraordinary collection, which amounts to more than several hundred million lines of code, gives its possessor the entire hacking capacity of the CIA.
The archive appears to have been circulated among former U.S. government hackers and contractors in an unauthorized manner, one of whom has provided WikiLeaks with portions of the archive.
"Year Zero" introduces the scope and direction of the CIA's global covert hacking program, its malware arsenal and dozens of "zero day" weaponized exploits against a wide range of U.S. and European company products, include,

  1. Apple's iPhone
  2. Google's Android
  3. Microsoft's Windows
  4. Samsung TVs,

...which are turned into covert microphones.
Since 2001 the CIA has gained political and budgetary preeminence over the U.S. National Security Agency (NSA).
The CIA found itself building not just its now infamous drone fleet, but a very different type of covert, globe-spanning force - its own substantial fleet of hackers.
The agency's hacking division freed it from having to disclose its often controversial operations to the NSA (its primary bureaucratic rival) in order to draw on the NSA's hacking capacities.
By the end of 2016, the CIA's hacking division, which formally falls under the agency's Center for Cyber Intelligence (CCI - below image), had over 5000 registered users and had produced more than a thousand,
hacking systems trojans viruses,
...and other "weaponized" malware.


https://preview.redd.it/3jsojkqxfdb41.jpg?width=366&format=pjpg&auto=webp&s=e92eafbb113ab3e972045cc242dde0f0dd511e96

Such is the scale of the CIA's undertaking that by 2016, its hackers had utilized more codes than those used to run Facebook.
The CIA had created, in effect, its "own NSA" with even less accountability and without publicly answering the question as to whether such a massive budgetary spend on duplicating the capacities of a rival agency could be justified.
In a statement to WikiLeaks the source details policy questions that they say urgently need to be debated in public, including whether the CIA's hacking capabilities exceed its mandated powers and the problem of public oversight of the agency.
The source wishes to initiate a public debate about the security, creation, use, proliferation and democratic control of cyberweapons.
Once a single cyber 'weapon' is 'loose' it can spread around the world in seconds, to be used by rival states, cyber mafia and teenage hackers alike.

Julian Assange, WikiLeaks editor stated that,
"There is an extreme proliferation risk in the development of cyber 'weapons'.
Comparisons can be drawn between the uncontrolled proliferation of such 'weapons', which results from the inability to contain them combined with their high market value, and the global arms trade.
But the significance of 'Year Zero' goes well beyond the choice between cyberwar and cyberpeace. The disclosure is also exceptional from a political, legal and forensic perspective."

Wikileaks has carefully reviewed the "Year Zero" disclosure and published substantive CIA documentation while avoiding the distribution of 'armed' cyberweapons until a consensus emerges on the technical and political nature of the CIA's program and how such 'weapons' should analyzed, disarmed and published.

Wikileaks has also decided to Redact (see far below) and Anonymize some identifying information in "Year Zero" for in depth analysis. These redactions include ten of thousands of CIA targets and attack machines throughout,
Latin America Europe the United States

While we are aware of the imperfect results of any approach chosen, we remain committed to our publishing model and note that the quantity of published pages in "Vault 7" part one ("Year Zero") already eclipses the total number of pages published over the first three years of the Edward Snowden NSA leaks.

Analysis

CIA malware targets iPhone, Android, smart TVs
CIA malware and hacking tools are built by EDG (Engineering Development Group), a software development group within CCI (Center for Cyber Intelligence), a department belonging to the CIA's DDI (Directorate for Digital Innovation).
The DDI is one of the five major directorates of the CIA (see above image of the CIA for more details).
The EDG is responsible for the development, testing and operational support of all backdoors, exploits, malicious payloads, trojans, viruses and any other kind of malware used by the CIA in its covert operations world-wide.
The increasing sophistication of surveillance techniques has drawn comparisons with George Orwell's 1984, but "Weeping Angel", developed by the CIA's Embedded Devices Branch (EDB), which infests smart TVs, transforming them into covert microphones, is surely its most emblematic realization.
The attack against Samsung smart TVs was developed in cooperation with the United Kingdom's MI5/BTSS.
After infestation, Weeping Angel places the target TV in a 'Fake-Off' mode, so that the owner falsely believes the TV is off when it is on. In 'Fake-Off' mode the TV operates as a bug, recording conversations in the room and sending them over the Internet to a covert CIA server.
As of October 2014 the CIA was also looking at infecting the vehicle control systems used by modern cars and trucks. The purpose of such control is not specified, but it would permit the CIA to engage in nearly undetectable assassinations.
The CIA's Mobile Devices Branch (MDB) developed numerous attacks to remotely hack and control popular smart phones. Infected phones can be instructed to send the CIA the user's geolocation, audio and text communications as well as covertly activate the phone's camera and microphone.
Despite iPhone's minority share (14.5%) of the global smart phone market in 2016, a specialized unit in the CIA's Mobile Development Branch produces malware to infest, control and exfiltrate data from iPhones and other Apple products running iOS, such as iPads.
CIA's arsenal includes numerous local and remote "zero days" developed by CIA or obtained from GCHQ, NSA, FBI or purchased from cyber arms contractors such as Baitshop.
The disproportionate focus on iOS may be explained by the popularity of the iPhone among social, political, diplomatic and business elites.
A similar unit targets Google's Android which is used to run the majority of the world's smart phones (~85%) including Samsung, HTC and Sony. 1.15 billion Android powered phones were sold last year.
"Year Zero" shows that as of 2016 the CIA had 24 "weaponized" Android "zero days" which it has developed itself and obtained from GCHQ, NSA and cyber arms contractors.
These techniques permit the CIA to bypass the encryption of, WhatsApp
  1. Signal
  2. Telegram
  3. Wiebo
  4. Confide
  5. Cloackman
...by hacking the "smart" phones that they run on and collecting audio and message traffic before encryption is applied.
CIA malware targets Windows, OSx, Linux, routers
The CIA also runs a very substantial effort to infect and control Microsoft Windows users with its malware.
This includes multiple local and remote weaponized "zero days", air gap jumping viruses such as "Hammer Drill" which infects software distributed on CD/DVDs, infectors for removable media such as USBs, systems to hide data in images or in covert disk areas ("Brutal Kangaroo") and to keep its malware infestations going.
Many of these infection efforts are pulled together by the CIA's Automated Implant Branch (AIB), which has developed several attack systems for automated infestation and control of CIA malware, such as "Assassin" and "Medusa".
Attacks against Internet infrastructure and webservers are developed by the CIA's Network Devices Branch (NDB).
The CIA has developed automated multi-platform malware attack and control systems covering Windows, Mac OS X, Solaris, Linux and more, such as EDB's "HIVE" and the related "Cutthroat" and "Swindle" tools, which are described in the examples section far below.
CIA 'hoarded' vulnerabilities ("zero days")
In the wake of Edward Snowden's leaks about the NSA, the U.S. technology industry secured a commitment from the Obama administration that the executive would disclose on an ongoing basis - rather than hoard - serious vulnerabilities, exploits, bugs or "zero days" to Apple, Google, Microsoft, and other US-based manufacturers.
Serious vulnerabilities not disclosed to the manufacturers places huge swathes of the population and critical infrastructure at risk to foreign intelligence or cyber criminals who independently discover or hear rumors of the vulnerability.
If the CIA can discover such vulnerabilities so can others.
The U.S. government's commitment to the Vulnerabilities Equities Process came after significant lobbying by US technology companies, who risk losing their share of the global market over real and perceived hidden vulnerabilities.
The government stated that it would disclose all pervasive vulnerabilities discovered after 2010 on an ongoing basis.
"Year Zero" documents show that the CIA breached the Obama administration's commitments. Many of the vulnerabilities used in the CIA's cyber arsenal are pervasive and some may already have been found by rival intelligence agencies or cyber criminals.
As an example, specific CIA malware revealed in "Year Zero" is able to penetrate, infest and control both the Android phone and iPhone software that runs or has run presidential Twitter accounts.
The CIA attacks this software by using undisclosed security vulnerabilities ("zero days") possessed by the CIA but if the CIA can hack these phones then so can everyone else who has obtained or discovered the vulnerability.
As long as the CIA keeps these vulnerabilities concealed from Apple and Google (who make the phones) they will not be fixed, and the phones will remain hackable.
The same vulnerabilities exist for the population at large, including the U.S. Cabinet, Congress, top CEOs, system administrators, security officers and engineers.
By hiding these security flaws from manufacturers like Apple and Google the CIA ensures that it can hack everyone at the expense of leaving everyone hackable.
'Cyberwar' programs are a serious proliferation risk
Cyber 'weapons' are not possible to keep under effective control.
While nuclear proliferation has been restrained by the enormous costs and visible infrastructure involved in assembling enough fissile material to produce a critical nuclear mass, cyber 'weapons', once developed, are very hard to retain.
Cyber 'weapons' are in fact just computer programs which can be pirated like any other. Since they are entirely comprised of information they can be copied quickly with no marginal cost.
Securing such 'weapons' is particularly difficult since the same people who develop and use them have the skills to exfiltrate copies without leaving traces - sometimes by using the very same 'weapons' against the organizations that contain them.
There are substantial price incentives for government hackers and consultants to obtain copies since there is a global "vulnerability market" that will pay hundreds of thousands to millions of dollars for copies of such 'weapons'.
Similarly, contractors and companies who obtain such 'weapons' sometimes use them for their own purposes, obtaining advantage over their competitors in selling 'hacking' services.
Over the last three years the United States intelligence sector, which consists of government agencies such as the CIA and NSA and their contractors, such as Booz Allan Hamilton, has been subject to unprecedented series of data exfiltrations by its own workers.
A number of intelligence community members not yet publicly named have been arrested or subject to federal criminal investigations in separate incidents.
Most visibly, on February 8, 2017 a U.S. federal grand jury indicted Harold T. Martin III with 20 counts of mishandling classified information.
The Department of Justice alleged that it seized some 50,000 gigabytes of information from Harold T. Martin III that he had obtained from classified programs at NSA and CIA, including the source code for numerous hacking tools.
Once a single cyber 'weapon' is 'loose' it can spread around the world in seconds, to be used by peer states, cyber mafia and teenage hackers alike.
U.S. Consulate in Frankfurt is a covert CIA hacker base
In addition to its operations in Langley, Virginia the CIA also uses the U.S. consulate in Frankfurt as a covert base for its hackers covering Europe, the Middle East and Africa.
CIA hackers operating out of the Frankfurt consulate ("Center for Cyber Intelligence Europe" or CCIE) are given diplomatic ("black") passports and State Department cover.
The instructions for incoming CIA hackers make Germany's counter-intelligence efforts appear inconsequential: "Breeze through German Customs because you have your cover-for-action story down pat, and all they did was stamp your passport" Your Cover Story (for this trip) Q: Why are you here? A: Supporting technical consultations at the Consulate. Two earlier WikiLeaks publications give further detail on CIA approaches to customs and secondary screening procedures.
Once in Frankfurt CIA hackers can travel without further border checks to the 25 European countries that are part of the Shengen open border area - including France, Italy and Switzerland.
A number of the CIA's electronic attack methods are designed for physical proximity.
These attack methods are able to penetrate high security networks that are disconnected from the internet, such as police record database. In these cases, a CIA officer, agent or allied intelligence officer acting under instructions, physically infiltrates the targeted workplace.
The attacker is provided with a USB containing malware developed for the CIA for this purpose, which is inserted into the targeted computer. The attacker then infects and exfiltrates data to removable media.
For example, the CIA attack system Fine Dining, provides 24 decoy applications for CIA spies to use.
To witnesses, the spy appears to be running a program showing videos (e.g VLC), presenting slides (Prezi), playing a computer game (Breakout2, 2048) or even running a fake virus scanner (Kaspersky, McAfee, Sophos).
But while the decoy application is on the screen, the underlying system is automatically infected and ransacked.
How the CIA dramatically increased proliferation risks
In what is surely one of the most astounding intelligence own goals in living memory, the CIA structured its classification regime such that for the most market valuable part of "Vault 7", the CIA's, weaponized malware (implants + zero days) Listening Posts (LP) Command and Control (C2) systems, ...the agency has little legal recourse.
The CIA made these systems unclassified.
Why the CIA chose to make its cyber-arsenal unclassified reveals how concepts developed for military use do not easily crossover to the 'battlefield' of cyber 'war'.
To attack its targets, the CIA usually requires that its implants communicate with their control programs over the internet.
If CIA implants, Command & Control and Listening Post software were classified, then CIA officers could be prosecuted or dismissed for violating rules that prohibit placing classified information onto the Internet.
Consequently the CIA has secretly made most of its cyber spying/war code unclassified. The U.S. government is not able to assert copyright either, due to restrictions in the U.S. Constitution.
This means that cyber 'arms' manufactures and computer hackers can freely "pirate" these 'weapons' if they are obtained. The CIA has primarily had to rely on obfuscation to protect its malware secrets.
Conventional weapons such as missiles may be fired at the enemy (i.e. into an unsecured area). Proximity to or impact with the target detonates the ordnance including its classified parts. Hence military personnel do not violate classification rules by firing ordnance with classified parts.
Ordnance will likely explode. If it does not, that is not the operator's intent.
Over the last decade U.S. hacking operations have been increasingly dressed up in military jargon to tap into Department of Defense funding streams.
For instance, attempted "malware injections" (commercial jargon) or "implant drops" (NSA jargon) are being called "fires" as if a weapon was being fired.
However the analogy is questionable.
Unlike bullets, bombs or missiles, most CIA malware is designed to live for days or even years after it has reached its 'target'. CIA malware does not "explode on impact" but rather permanently infests its target. In order to infect target's device, copies of the malware must be placed on the target's devices, giving physical possession of the malware to the target.
To exfiltrate data back to the CIA or to await further instructions the malware must communicate with CIA Command & Control (C2) systems placed on internet connected servers.
But such servers are typically not approved to hold classified information, so CIA command and control systems are also made unclassified.
A successful 'attack' on a target's computer system is more like a series of complex stock maneuvers in a hostile take-over bid or the careful planting of rumors in order to gain control over an organization's leadership rather than the firing of a weapons system.
If there is a military analogy to be made, the infestation of a target is perhaps akin to the execution of a whole series of military maneuvers against the target's territory including observation, infiltration, occupation and exploitation.
Evading forensics and anti-virus
A series of standards lay out CIA malware infestation patterns which are likely to assist forensic crime scene investigators as well as, Apple
  1. Microsoft
  2. Google
  3. Samsung
  4. Nokia
  5. Blackberry
  6. Siemens
  7. anti-virus companies,
...attribute and defend against attacks.
"Tradecraft DO's and DON'Ts" contains CIA rules on how its malware should be written to avoid fingerprints implicating the "CIA, US government, or its witting partner companies" in "forensic review".
Similar secret standards cover the, use of encryption to hide CIA hacker and malware communication (pdf) describing targets & exfiltrated data (pdf) executing payloads (pdf) persisting (pdf), ...in the target's machines over time.
CIA hackers developed successful attacks against most well known anti-virus programs.
These are documented in, AV defeats Personal Security Products Detecting and defeating PSPs PSP/DebuggeRE Avoidance For example, Comodo was defeated by CIA malware placing itself in the Window's "Recycle Bin". While Comodo 6.x has a "Gaping Hole of DOOM".
CIA hackers discussed what the NSA's "Equation Group" hackers did wrong and how the CIA's malware makers could avoid similar exposure.

Examples

The CIA's Engineering Development Group (EDG) management system contains around 500 different projects (only some of which are documented by "Year Zero") each with their own sub-projects, malware and hacker tools.
The majority of these projects relate to tools that are used for,
penetration infestation ("implanting") control exfiltration
Another branch of development focuses on the development and operation of Listening Posts (LP) and Command and Control (C2) systems used to communicate with and control CIA implants.
Special projects are used to target specific hardware from routers to smart TVs.
Some example projects are described below, but see the table of contents for the full list of projects described by WikiLeaks' "Year Zero".
UMBRAGE
The CIA's hand crafted hacking techniques pose a problem for the agency.
Each technique it has created forms a "fingerprint" that can be used by forensic investigators to attribute multiple different attacks to the same entity.
This is analogous to finding the same distinctive knife wound on multiple separate murder victims. The unique wounding style creates suspicion that a single murderer is responsible.
As soon one murder in the set is solved then the other murders also find likely attribution.
The CIA's Remote Devices Branch's UMBRAGE group collects and maintains a substantial library of attack techniques 'stolen' from malware produced in other states including the Russian Federation.
With UMBRAGE and related projects the CIA cannot only increase its total number of attack types but also misdirect attribution by leaving behind the "fingerprints" of the groups that the attack techniques were stolen from.
UMBRAGE components cover,
keyloggers
  1. password collection
  2. webcam capture
  3. data destruction
  4. persistence
  5. privilege escalation
  6. stealth
  7. anti-virus (PSP) avoidance
  8. survey techniques

Fine Dining
Fine Dining comes with a standardized questionnaire i.e menu that CIA case officers fill out.
The questionnaire is used by the agency's OSB (Operational Support Branch) to transform the requests of case officers into technical requirements for hacking attacks (typically "exfiltrating" information from computer systems) for specific operations.
The questionnaire allows the OSB to identify how to adapt existing tools for the operation, and communicate this to CIA malware configuration staff.
The OSB functions as the interface between CIA operational staff and the relevant technical support staff.
Among the list of possible targets of the collection are,
  • 'Asset'
  • 'Liason Asset'
  • 'System Administrator'
  • 'Foreign Information Operations'
  • 'Foreign Intelligence Agencies'
  • 'Foreign Government Entities'
Notably absent is any reference to extremists or transnational criminals. The 'Case Officer' is also asked to specify the environment of the target like the type of computer, operating system used, Internet connectivity and installed anti-virus utilities (PSPs) as well as a list of file types to be exfiltrated like Office documents, audio, video, images or custom file types.
The 'menu' also asks for information if recurring access to the target is possible and how long unobserved access to the computer can be maintained.
This information is used by the CIA's 'JQJIMPROVISE' software (see below) to configure a set of CIA malware suited to the specific needs of an operation.
Improvise (JQJIMPROVISE)
  1. 'Improvise' is a toolset for configuration, post-processing, payload setup and execution vector
  2. selection for survey/exfiltration tools supporting all major operating systems like,
  3. Windows (Bartender)
  4. MacOS (JukeBox)
  5. Linux (DanceFloor)
  6. Its configuration utilities like Margarita allows the NOC (Network Operation Center) to customize tools
based on requirements from 'Fine Dining' questionnaires.
HIVE
HIVE is a multi-platform CIA malware suite and its associated control software.
The project provides customizable implants for Windows, Solaris, MikroTik (used in internet routers) and Linux platforms and a Listening Post (LP)/Command and Control (C2) infrastructure to communicate with these implants.
The implants are configured to communicate via HTTPS with the webserver of a cover domain; each operation utilizing these implants has a separate cover domain and the infrastructure can handle any number of cover domains.
Each cover domain resolves to an IP address that is located at a commercial VPS (Virtual Private Server) provider.
The public-facing server forwards all incoming traffic via a VPN to a 'Blot' server that handles actual connection requests from clients.
It is setup for optional SSL client authentication: if a client sends a valid client certificate (only implants can do that), the connection is forwarded to the 'Honeycomb' toolserver that communicates with the implant.
If a valid certificate is missing (which is the case if someone tries to open the cover domain website by accident), the traffic is forwarded to a cover server that delivers an unsuspicious looking website.
The Honeycomb toolserver receives exfiltrated information from the implant; an operator can also task the implant to execute jobs on the target computer, so the toolserver acts as a C2 (command and control) server for the implant.
Similar functionality (though limited to Windows) is provided by the RickBobby project.
See the classified user and developer guides for HIVE.

Frequently Asked Questions

Why now?
WikiLeaks published as soon as its verification and analysis were ready. In February the Trump administration has issued an Executive Order calling for a "Cyberwar" review to be prepared within 30 days.
While the review increases the timeliness and relevance of the publication it did not play a role in setting the publication date.
Redactions
Names, email addresses and external IP addresses have been redacted in the released pages (70,875 redactions in total) until further analysis is complete. Over-redaction: Some items may have been redacted that are not employees, contractors, targets or otherwise related to the agency, but are, for example, authors of documentation for otherwise public projects that are used by the agency.
Identity vs. person: the redacted names are replaced by user IDs (numbers) to allow readers to assign multiple pages to a single author. Given the redaction process used a single person may be represented by more than one assigned identifier but no identifier refers to more than one real person.
Archive attachments (zip, tar.gz, ...), are replaced with a PDF listing all the file names in the archive. As the archive content is assessed it may be made available; until then the archive is redacted.
Attachments with other binary content, are replaced by a hex dump of the content to prevent accidental invocation of binaries that may have been infected with weaponized CIA malware. As the content is assessed it may be made available; until then the content is redacted.
Tens of thousands of routable IP addresses references, (including more than 22 thousand within the United States) that correspond to possible targets, CIA covert listening post servers, intermediary and test systems, are redacted for further exclusive investigation.
Binary files of non-public origin, are only available as dumps to prevent accidental invocation of CIA malware infected binaries.
Organizational Chart
The organizational chart (far above image) corresponds to the material published by WikiLeaks so far.
Since the organizational structure of the CIA below the level of Directorates is not public, the placement of the EDG and its branches within the org chart of the agency is reconstructed from information contained in the documents released so far.
It is intended to be used as a rough outline of the internal organization; please be aware that the reconstructed org chart is incomplete and that internal reorganizations occur frequently.
Wiki pages
"Year Zero" contains 7818 web pages with 943 attachments from the internal development groupware. The software used for this purpose is called Confluence, a proprietary software from Atlassian.
Webpages in this system (like in Wikipedia) have a version history that can provide interesting insights on how a document evolved over time; the 7818 documents include these page histories for 1136 latest versions.
The order of named pages within each level is determined by date (oldest first). Page content is not present if it was originally dynamically created by the Confluence software (as indicated on the re-constructed page).
What time period is covered?
The years 2013 to 2016. The sort order of the pages within each level is determined by date (oldest first).
WikiLeaks has obtained the CIA's creation/last modification date for each page but these do not yet appear for technical reasons. Usually the date can be discerned or approximated from the content and the page order.
If it is critical to know the exact time/date contact WikiLeaks.
What is "Vault 7"
"Vault 7" is a substantial collection of material about CIA activities obtained by WikiLeaks.
When was each part of "Vault 7" obtained?
Part one was obtained recently and covers through 2016. Details on the other parts will be available at the time of publication.
Is each part of "Vault 7" from a different source?
Details on the other parts will be available at the time of publication.
What is the total size of "Vault 7"?
The series is the largest intelligence publication in history.
How did WikiLeaks obtain each part of "Vault 7"?
Sources trust WikiLeaks to not reveal information that might help identify them.
Isn't WikiLeaks worried that the CIA will act against its staff to stop the series?
No. That would be certainly counter-productive.
Has WikiLeaks already 'mined' all the best stories?
No. WikiLeaks has intentionally not written up hundreds of impactful stories to encourage others to find them and so create expertise in the area for subsequent parts in the series. They're there.
Look. Those who demonstrate journalistic excellence may be considered for early access to future parts.
Won't other journalists find all the best stories before me?
Unlikely. There are very considerably more stories than there are journalists or academics who are in a position to write them.
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