Cryptographer Slams Anthropic for Ignoring Reported Flaw

Cryptographer Matthew Green revealed he reported an encryption replay attack vulnerability to Anthropic in May, only to have it dismissed as outside their threat model—while the attack has now been exploited for months.

2026-09-12 ~ 2026-09-12 · 2 related posts

• Cryptographer says Anthropic dismissed encryption flaw he reported in May, now exploited for months — Miles_Brundage · 2026-09-12
• Cryptographer slams Anthropic for dismissing replay-attack encryption bugs he reported in May — Apoorva__Lal · 2026-09-12