# SSTIC challenge 2023 - Step 2.a

*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 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.*

*This is the solution of the challenge “GCM” given during the Insomni’hack teaser 2023. It was an example of nonce re-use in AES GCM computation.*