README.md

GreHack 2019 CTF challenge

One of the challenges of the GreHack2019 CTF was a white-box.

Components

• target contains the original challenge and instructions how to compile it and how to use it.
• DCA contains the DCA attack against this challenge.
• DFAr8 contains the DFA attack on the 8th round against this challenge.

Other write-ups

• Not a writeup but more info about the internal countermeasure on DFA here: https://gist.github.com/nreboud/863b9e49b5584cc6d6bea8f13aab3e05