Applied Cryptography expert

PlaidCTF 2017 - Multicast

The same flag is encrypted 5 times with RSA small public exponent and linear padding. The generalization of HÃ¥stad’s broadcast attack and the Coppersmith method allow to recover the flag.

Nuit du hack quals 2016 - Invest

This is the solution of the challenge “Invest” given during the Nuit du Hack 2016 qualification CTF. We received a invest.pcapng file which contains a schematic, encrypted files and a binary chain. Once the binary chain was passed in the schematic we obtained a password to decrypt with OpenSSL the files. The resulting file is a Word document with the Flag inside.