Steve Weis: Claude also traced the 1977 DES S-box test vectors to rand() on a PDP-11 running Unix V6
Steve Weis @sweisX
Why it matters
First-hand claim by an Anthropic team member of a second historical-cryptography result not in the Anthropic post (~18k views).
Summary
Posted Oct 16 19:01 UTC by Steve Weis (@sweis); 18,319 views, 224 likes, 26 reposts when read via api.fxtwitter.com on 2026-10-17. Quotes @sweis: “CLAUDE FOUND THE SEEDS https://www.anthropic.com/research/ecdsa-curve-origins“.
Archived text
As a treat, Claude also reverse engineered the NBS’s 1977 DES S-box test vectors and determined that it was generated on a PDP-11 Unix V6 using rand() .
Quoting @sweis: CLAUDE FOUND THE SEEDS https://www.anthropic.com/research/ecdsa-curve-origins