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The British read unsteckered Enigma messages sent during the Spanish Civil War, [15] and also some Italian naval traffic enciphered early in World War II. The strength of the security of the ciphers that were produced by the Enigma machine was a product of the large numbers associated with the scrambling process.
The Imitation Game is a 2014 American biographical thriller film directed by Morten Tyldum and written by Graham Moore, based on the 1983 biography Alan Turing: The Enigma by Andrew Hodges. The film's title quotes the name of the game cryptanalyst Alan Turing proposed for answering the question "Can machines think?", in his 1950 seminal paper ...
The Enigma machine is a cipher device developed and used in the early- to mid-20th century to protect commercial, diplomatic, and military communication. It was employed extensively by Nazi Germany during World War II, in all branches of the German military. The Enigma machine was considered so secure that it was used to encipher the most top ...
Just before the outbreak of World War II, Welchman and three other top mathematicians were recruited to the Government Code and Cypher School (GC&CS), which aimed to break the German Enigma Code. The Germans used the Enigma machine to encrypt their messages, which they believed to be unbreakable.
A similar break into the most secure Japanese diplomatic cipher, designated Purple by the US Army Signals Intelligence Service, started before the US entered the war. Product from this source was called Magic. On the other side, German code breaking in World War II achieved some notable successes cracking British naval and other ciphers.
The Hut Six Story: Breaking the Enigma Codes. London & New York: Allen Lane & McGraw-Hill. ISBN 0-7139-1294-4. Gordon Welchman, The Hut Six Story: Breaking the Enigma Codes (1997: Cleobury Mortimer, Baldwin) ISBN 978-0-947712-34-1; Irene Young, Enigma Variations: A Memoir of Love and War (1990, Mainstream Publishing, Edinburgh) ISBN 1-85158-294-0
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Up to July 25, 1939, the Poles had been breaking Enigma messages for over six and a half years without telling their French and British allies. On December 15, 1938, two new rotors, IV and V, were introduced (three of the now five rotors being selected for use in the machine at a time).