| Cryptography is the enciphering and deciphering of messages in secret code or cipher. |
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| Enigma was the German term for an ingenious, lightweight and robust text enciphering machine with its own power source. |
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| Enigma is a very sophisticated enciphering machine, and Shark is its ultimate refinement. |
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| Specifically, he realized that enciphering plain text with a keyword rendered the cipher text subject to modular arithmetic. |
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| Many German radio messages were encoded using the Enigma machine and other enciphering techniques and the codes were changed frequently. |
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