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Schneier on Security · September 9, 2026

Claude Fable Solves a Historical Cipher

HistoryCybersecurityComputer Science
THE AI ANGLE
Solving a centuries-old cipher through rapid searching and testing

Claude Fable 5.1 reportedly solved a 370-year-old cipher in forty-four minutes, demonstrating how AI models excel at cryptanalytic tasks that require rapid searching, testing, and pattern recognition. The case highlights both the potential of AI as an automated force multiplier for resolving long-standing security puzzles and the ongoing need for rigorous human verification against primary historical sources.

THE TEACHING ANGLE
Instructors can explore the tension between whether AI solves historical puzzles through brute-force parallelized searching or structured reasoning, emphasizing the necessity of cross-checking automated findings against physical archival records.

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