-
(Reverse - CWTE 2025) PORS
TL;DR: Program obfuscation based on sigreturn frames. PORS is a challenge I authored on the behalf of ECSC Team France for Compete With Team Europe 2025, a training CTF where all the ECSC national teams play against Team Europe. It has been solved by 3 teams during the CTF. Description:...
-
(Reverse - FCSC 2025) Transient Protector
TL;DR: Obfuscation of a logic circuit using Spectre-like mechanisms based on speculative code execution. Description: Our supplier claims he just developped a new and revolutionnary protector for our software’s DRM. Here is a sample keygenme protected with its method. I heard that no DRM is unbreakable. Would you be able...
-
(Reverse - FCSC 2025) Nessie
TL;DR: Reverse engineering of a NES (Nintendo Entertainment System) ROM. Description: A friend of yours, in his forties, spent his carefree youth playing a game called Nessie. He never managed to finish the game despite having spent long hours in front of his NES. Will you be able to do...