plaidCTF 2014 - rsa (for450)
rsa Forensics (450 pts) -------------- Our archaeologists recovered a dusty and corrupted old hard drive used by The Plague in his trips into the past. It contains a private key, but this has long since been lost to bitrot. Can you recover the full key from the little information we have recovered?
plaidCTF 2014 - graphs (crypto200)
This challenge was about breaking a custom public key encryption system.
graphs Cryptography (200 pts) -------------- In this era, block ciphers hadn't even been invented. The Plague created this system based on problems he knew to be NP hard, but there must be something you can do to decode his messages.
We were given a python implementation of the system, the Plague’s public key and an encrypted message. The implementation includes encryption, decryption (given a private key) and key generation.