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Details of Alan Turing's Voice Encryption System - Schneier on Security

Summary by schneier.com
Really interesting piece of cryptographic history: In November 2023, a large cache of his wartime papers—nicknamed the “Bayley papers”—was auctioned in London for almost half a million U.S. dollars. The previously unknown cache contains many sheets in Turing’s own handwriting, telling of his top-secret “Delilah” engineering project from 1943 to 1945. Delilah was Turing’s portable voice-encryption system, named after the biblical deceiver of men.…
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schneier.com broke the news on Friday, July 17, 2026.
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