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Details of Alan Turing’s Voice Encryption System
In November 2023, a collection of Alan Turing's wartime papers sold at auction in London for approximately half a million US dollars. The cache, known as the Bayley papers, includes handwritten materials documenting Turing's classified Delilah project from 1943 to 1945, a portable voice-encryption system. The papers survived because Donald Bayley, a colleague who worked with Turing, preserved them until his death in 2020.
Why it matters: Practitioners studying cryptographic history and defense systems can examine original source materials on early voice encryption techniques and wartime engineering approaches to secure communications.
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