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Andrew Hodges, Simon Singh

Bletchley Park, Enigma and the Anonymous Heroes of Cryptography

Hay Festival 2000 , 
Alan Turing's biographer and the author of The Code Book tell the stories behind some of the most secret code-breaking achievements in history, including Alan Turing's cracking of the German Enigma cipher and Charles Babbage's decipherment of the supposedly unbreakable Vigenere cipher.