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More Recent Mechanical Cryptographic Devices
A Theoretical Approach to Cryptography
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additive cipher affine cipher algorithm assume base key basic pins binary bits block cipher Chapter characteristic polynomial characters cipher feedback system cipher system ciphertext Clearly column complete consecutive consider corresponding course cryptanalyst cryptogram cryptogram space Data Encryption Standard deciphering decipherment denote determine discuss electronic enciphering encipherment error example EXERCISE feedback function Figure frequency give given guess illustrate INDEX OF COINCIDENCE initial input instance integer interceptor inverse keyword length linear equivalence lug cage machine means merely message key message space method modulo monoalphabetic cipher non-linear number of possibilities obtain one-time-pad output sequence particular period permutations pin settings polyalphabetic cipher positions probability problem random reader reason Section segments shift register shift register sequence statistical stream cipher substitution alphabet synchronization Theorem transformation transmission transmitted truth table values Vigenere cipher wheel ZZ OZ ZZ ZZ ZZ