cryptohard

Billy Bones

alfactf

Task: DES-encrypted maze path with 128 forks. Solution: Exploited uint16_t type truncation bug in key handling to reduce key space from 2^56 to 2^16, then brute-forced with known plaintext attack.

$ ls tags/ techniques/
bruteforcetype_confusiondesecb_modekey_truncationuint16_bugknown_plaintextc_programmingarm_architecture
Known-plaintext attack on DES ECBKey space reduction via type truncation bugBrute-force 16-bit key space
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