2020-08-25

[public] 40.5K views, 1.73K likes, 12.0 dislikes audio only

LiveOverflow

Reverse engineering challenge from the Google CTF Finals 2019. Robin implemented a FPGA simulator in a shader to run it on a GPU. The players had to reverse engineer the software and figure out the algorithm implemented in hardware.

Challenge Sources: https://github.com/google/google-ctf/tree/master/2019/finals/reversing-gpurtl

Gynvael: https://www.youtube.com/user/GynvaelEN

00:00 - Introduction

01:35 - GPURTL Challenge Motivation

03:13 - Gynvael's Challenge Approach

04:40 - The Mysterious Image

08:55 - Challenge Files

10:45 - Interpreting the Graphic

11:21 - The Lua script source code

14:38 - The FPGA bitstream

16:56 - Shader code

23:50 - The gpurtl Rust binary

26:48 - Verilog Code

27:48 - Possible Solution Paths

32:44 - Verilog Synthesis

35:30 - Development Issues

38:55 - Solution by Team pasten

"advertisement" because Google paid for flights and hotel.

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