Claude helps uncover that Skipjack cipher's s-box comes from srand48(48571)
matthew_d_green · x · 2026-10-18
Cryptographer Stefan Edward (sweis) shared that Claude, working with @avhwl, figured out that the Skipjack cipher's s-box (F-table) is generated by srand48(48571) plus some swaps—suggesting the NSA-designed table may just be output of a fixed-seed PRNG. A concrete, verifiable reverse-engineering result credited to an AI model, drawing follow-up discussion from security researchers.
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