Schneier on Security 2026-09-09

Claude Fable Solves a Historical Cipher

Refract AI Intelligence Digest

Claude Fable 5.1 solved a 370-year-old cipher in forty-four minutes. This tracks with what I wrote about AIs doing mathematics: It’s good at things that involve lots of searching and testing.

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Source: Schneier on Security · 2026-09-09

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