This is the solution of the challenge “HR Complaints” from NorthSec 2023. It was an exploitation of the ROCA vulnerability on a 512-bit long RSA key.

This is the solution of the step 2.A of the SSTIC 2023. It was a nonce generation flaw of an implementation of a multi-signature scheme called MuSig2.

This is the solution of the challenge “Ownercheap” given during the Insomni’hack 2023. It was a Ethereum smart contract initialization bug which lead to contract ownership takeover.

This is the solution of the challenge “RSA” given during the NCSC CTF challenge. Is is about RSA on floating point numbers.

Compile and emulate RISC-V scalar cryptography extensions with GCC and Qemu.

This is the solution of the challenge “Artscii” given during the Insomni’hack teaser 2023. It consists in recovering a flag written in ASCII art and scrambled.