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The highly eccentric Alfred Dillwyn Knox, known simply as 'Dilly', was one of the leading figures in the British codebreaking successes of the two world wars. During the first, he was the chief codebreaker in the Admiralty, breaking the German navy's main flag code, before going on to crack the German Enigma ciphers during the Second World War at Bletchley Park. It was at Bletchley that Dilly enjoyed the triumphant culmination of his life's work: a reconstruction of the Enigma machine used by the Abwehr, the German Secret Service. This ensured that the British were fully aware of what the German commanders knew about the Allied plans for the invasion of Europe, allowing MI5 and MI6 to use captured German spies to feed false information back to the Nazi spymasters. Dilly's codebreaking skills played a vital part in the deception operation that ensured the success of the D-Day landings. Knox, however, did not live to see the fruits of his work, sadly dying of cancer in 1943.

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9781906447151

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Mavis Batey was a Bletchley Park codebreaker from 1940 to 1945, and a key figure in the codebreaking intelligence which led to the British victory at the Battle of Cape Matapan. The author of numerous books, Mavis advised Kate Winslet during the making of the film Enigma. Mavis Batey died in 2013.

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