FPGA simulated on a GPU - GPURTL Google CTF Finals 2019 (reversing)

[@j3r3miasmg]

I feel represented every time he puts his hand to his forehead and laughs at how crazy this challenge is.

[@viniciusalmeida7037]

It's not everyday that you find your professor on the comment section of a random video.

[@j3r3miasmg]

@@viniciusalmeida7037 HAHAHAHA

[@SauravKumar-tf3uv]

It's always great to hear technical conversations :). You really should do it more

[@fakhermokadem11]

Should you have listen to Google CTF writers explain their thought train for 40minutes again? Heck yeah!

[@fluffy_tail4365]

This challenge is nuts and I love how the code is public, is such a lovely implementation and actually pretty useful. Thanks for letting me discover it

[@gecko4ever]

Great interview, very interesting. Thanks for the detailled analysis and explanation together with Robin and Gynvael.

[@nilp0inter2]

It was a very clever move to just use the round function of the feistel network to make the decryption function. Good thinking!

[@uniquechannelnames]

Oh yeeaaah totes clever move, couldnt believe how the round function of the feistel network made the decryption function... I feel so lacking in knowledge haha.I *barely* understood it.

[@wuddadid]

I know absolutely nothing.

[@nickadams2361]

besides that.

[@tuz2044]

Yes please! More of this :D

[@pipony8939]

that's the last one /s

[@CodePhiles]

great interview , with intense of ideas !!, the approach of the team who solved it was great to get the function of the black box

[@bigmistqke]

Loving this serie!

[@arunmagesh]

damn! FPGA on gpu is something else. 😯😯😯

[@mushenji]

Very cool

[@bluegizmo1983]

Most of that went way over my head but I still loved it!

[@lightb00k34]

Make more videos of these format please 😍😍

[@bhuvaneshs.k638]

This video is great.... Thankyou for this video

[@CyReVolt]

Mindblowing and decent - really cool, thank you! :)

[@hadinossanosam4459]

watching this to procrastinate preparing for my VLSI I exam (Verilog, RTL, FPGA programming, HLS, ...) xD motivation is weird

[@snooks5607]

impressive on many levels

[@robinhood3841]

I am really really curious to know how browser challenge exploitation was and how the teams manage to solve that challenge

[@allthingsreversed]

2019 - the year when one could cough from (I guess) air conditioning while being closer than 2m from other person - good year ;) Also good video & interview! And indeed interesting chall. Please do more.

[@natnaieleasrat9786]

You're awesome!

[@superhero1]

Your content is awesome! Greetings

[@dxdarrel8843]

That Rust source code is actually difficult understand by itself, let alone reverse engineer the compiled binary.......

[@rickyhan7023]

What an absolute Chad 🤣

[@nickadams2361]

jesus man what a boss

[@devilmaycry1980]

That was pretty cool :D

[@movax20h]

I just played a bit with it, extracted the shader, and they didn't even enabled size or speed optimisation, and left all debug information (like identifiers, function names, uninlined). Indeed disasembly using SPIRV-Cross was perfect. It recovered full source code back with variable names, and code structure intact. Doing a quick `spirv-opt --strip-debug -O` would really make things harder. But I guess, it is fine, just some fun, and limited time.

[@rob6129]

Very interesting

[@SangharshSeth]

Great video. Please upload other challenges from gctf if possible.

[@jhbonarius]

Many commercial FPGAs encrypt their bitstream nowadays, to prevent reverse engineering

[@allmycircuits8850]

There are also FPGAs with embedded code ROM, so no code 'leaks' outside at all. Then there is 'security bit', if it was set when programming, this ROM cannot be read back, only reprogrammed completely.

[@CyReVolt]

That is really sad. :( Well, also a challenge of course, but yea, really doesn't help in other situations.

[@jhbonarius]

@@CyReVolt it helps a lot. Else competitors will copy your product.

[@CyReVolt]

Yes, I would love that. :) Not sure in what regard it would help to keep others from contributing to development and finding improvements. Otherwise it's a problem for economy, education and the environment.

[@jhbonarius]

@@CyReVolt that's not how it works. There might be some open source projects around, but they work with source code, not bit streams. Most of us need to pay our bills, thus need a salary. If the competition can just steal our work, without any effort, we'll have a problem.

[@L2002]

Nice Video :)

[@artifactingreality]

this is too hard wtf. can you make one where you reverse engineer ms paint?

[@seditt5146]

In Vulkan it is your responsibility to handle pipeline barriers why exactly was the bug raised?

[@capsuleone3543]

Eii buddy, you should know how to access to the GPU in chromebooks.They don't provide you almost any information(even I don't knowthemodel), and less than that, modify in any way.Could you do a research about it, to see what's happening there? THANKS

[@HritikV]

Can we get a video on cracking encryption with feistel structure?

[@To-mos]

"Implemented a FPGA simulator in a shader to run it on a GPU." And here I am thinking cook-torrance brdf is impressive.

[@usamaxwati4696]

That's so kewl. ❤️

[@lakmalsiriwardhana]

I know absolutely nothing. (2)

[@IBMboy]

Reminds me of the ubershaders developed for the dolphin emulator

[@RishankKumar]

This video messed up with the vibration motor inside mobile phone

[@Cieric]

When he mentioned that it was something he wanted to be usable afterwards, I kinda expected to be able to find the project somewhere. It appears that the google CTF page has some sources but no link to anywhere the actual project is being maintained.

[@idrivebugattiveyron]

They don't, on their github they have mentioned, it's like an unstable release and can't be trusted

[@1e1001]

yes

[@idiotknobe8656]

your description says LUA instead of Lua please don't do that besides that, great video as always

[@roeesi-personal]

וואי איזה מלכים פסטן!

[@cothan2062]

From what I see, the author didn't really reverse his binary, from the author's perspective, it's easy to underestimate the difficulty of how complex the language became after the compilation step. However, the teams solved this challenge had insane skills.

[@pengpleb]

My thoughts exactly, the guy just created some binaries using some custom code and went like: "ok, here you go, reverse them". The project itself looks really cool, but the "challenge design" was lazy.

[@LiveOverflow]

I wholeheartedly disagree. He had a lot of thoughts on that reversing part, which he even talks about in this video. And also keep in mind that the challenge is play-tested before used in the competition. To test for the difficulty and if it is solvable. In this case Gynvael was the tester for it. So this is a very well designed challenge.

[@9y028]

This guy literally sounds like Matt Parker.

[@0xbyt3z]

I realize that after seeing your comment. He may be his son.

[@abdarafi]

Maybe his relatives

[@glxxyz]

This was autoplaying and I wondered what Michael Cera was talking about

[@lunyxs7085]

Hello, I am a new viewer to your channel and have watched some of your videos. I like your content; it was inspired me to start trying to learn assembly code. It also made me learn python and some other stuff. I would need your help^^, I wanted to try to learn assembly code, so since i couldn't get it i tried to crack an app that i needed. however, i started by looking at all the files. And, I found the source code in the files. So, since I have some experience with source code, I just modified the script. And now it doesn't launch anymore. I tried searching the checks on google but its been 2 weeks i've been trying for nothing and I still can't find what is causing this. I also have to say that the source code of the old ver works in the new ver etc, obvious. But I can't find the check that would make it work. The software's name is TimeBolt! If you could help me find what the check is, it'd be fantastic!

[@sniff122plays]

any other i3wm users in the comments?

[@KanalMcLP]

I think you could do better on the lighting in the introduction ;)

[@viciaoxxx]

who's that guy 👀🍑🤸🏻‍♂️🍤📿

[@g0w1h4m]

Time to get a haircut dude 😂

[@VictorNascimentoo]

1 view

[@rutikrojekar7094]

First...Wasn't this early before😅

[@superprocz]

2.

[@nickadams2361]

anything that is a pain in the ass python makes easy

[@sha.68]

First comment?

[@satosiwu148]

mission failed you'll get em next time

[@sha.68]

@@satosiwu148 🤕