This is my writeup for the 2020 SSTIC’s challenge.
The SSTIC is the biggest french security conference. Its annual challenge is generally considered to be a difficult reversing challenge that involves fun technologies.
Looking back on the past few weeks, I think it took me more than 120 hours to solve the whole challenge, which is gargantuous. Nevertheless, it’s the first year I managed to finish it so I’m really happy. Note that I’m a novice reverser whereas this year’s winner has flagged all steps in 36 hours total, gratz to you @0xf4b.
I’m not spoiling you the technologies involved yet, they’re quite fun and it’s a part of the challenge to discover them on the go. If you’re a hardcode reverser, jump to step 4.
Here are the 6 steps: