Airbus made a "private" challenge called « Trust the future » and accessible only by some selected schools (epitech, insa, and others). I wasn't invited to participate but there was a "crypto" challenge I thought was interesting. Since the challenge just finished I'm posting the write up. Crypto challenge #1

We have 4 certificates and a challenge1 file that seems to be a s/mime file of a pkcs#7 e ...