Schneier on Security

Claude Fable Solves a Historical Cipher

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.

Tags: AI, cryptography, history of cryptography, mathematics

Posted on September 9, 2026 at 7:08 AM • 0 Comments