Schneier on Security 2026-09-09

Claude Fable Solves a Historical Cipher

Refract AI Intelligence Digest

BLUF

AI is rapidly mastering cryptanalysis, threatening the longevity of current encryption standards.

NEWS

Schneier on Security reported that Claude Fable 5.1 cracked a 370-year-old historical cipher in just forty-four minutes. This achievement confirms AI's strength in tasks requiring extensive searching and testing within mathematical domains.

Why I Care

Accelerated cryptanalysis capabilities mean sensitive data encrypted today could be vulnerable to future AI decryption attacks. Governments and enterprises must prepare for a landscape where automated tools break codes faster than humans.

Next Steps

Security architects should evaluate encryption lifespans against AI progression by end-of-year 2026. Organizations must prioritize migration to AI-resistant cryptographic standards immediately.

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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