It was Germany’s most guarded secret—until a team of mathematicians and spies shattered it. The Enigma story begins at Bletchley Park.

Object Details Author Churchhouse, R. F Contents 1. Introduction -- 2. From Julius Caesar to simple substitution -- 3. Polyalphabetic systems -- 4. Jigsaw ciphers -- 5. Two-letter ciphers -- 6. Codes ...

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During World War II, the Germans used an encryption device called the Enigma, which Polish and English mathematicians worked tirelessly to crack.

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Seizing the enigma : the race to break the German U-boat codes, 1939-1943 / David Kahn Smithsonian Libraries and Archives ...