| 31. | The dockyards produced more than 300, 000 cipher machines from a model bought in an undisclosed " European country ".
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| 32. | His son, Nigel de Grey was one of the codebreakers that worked on decrypting messages from the Enigma cipher machine.
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| 33. | The German Enigma machine is a family of about a dozen different cipher machine designs, each with its own problems.
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| 34. | This led to the development of electromechanical devices as cipher machines, and to the only unbreakable cipher, the one time pad.
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| 35. | Most German messages decrypted at Bletchley were produced by one or another version of the Lorenz SZ42 on-line teleprinter cipher machine.
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| 36. | In 1964, Lyubimov's cover was blown in a failed attempt to recruit a cipher machine operator to spy for the Soviets.
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| 37. | It was during those hearings that the Japanese learned, for the first time, that the Purple cipher machine had indeed been broken.
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| 38. | Over the following two months up to January 1942, Tutte and colleagues worked out the complete logical structure of the cipher machine.
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| 39. | "" The room where I operated the cipher machine also contained a teleprinter which was connected to the main signal station in Townsville.
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| 40. | In the 1920s four men in different countries invented rotor cipher machines to produce a key stream to act instead of a tape.
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