Claude reverse-engineers 1977 DES test vectors to a PDP-11 rand() seed
chrisrohlf · x · 2026-10-17
sweis shares that Claude reverse-engineered NBS's 1977 DES S-box test vectors and determined they were generated on a PDP-11 running Unix V6 using rand() — effectively recovering the random seed behind decades-old cryptographic test data. A striking showcase of the model's historical forensics and reasoning capability.
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