Details of Alan Turing’s Voice Encryption System

A recently auctioned collection of wartime papers, known as the Bayley papers, has shed light on Alan Turing's secret voice encryption system, called Delilah. The collection, which sold for nearly half a million dollars, contains handwritten notes by Turing himself, detailing the project from 1943 to 1945. The Delilah system was a portable encryption method, named after a biblical figure. The papers also include notes written by Bayley, who recorded information while Turing spoke. The survival of these papers is attributed to Bayley. The auction of the Bayley papers in November 2023 has made this previously unknown information available.