## CryptologyCryptology, the art and science of 'secret writing', provides ideal methods to solve the problems of transmitting information secretly and securely. The first half of this book studies and analyzes classical cryptosystems. The second half looks at the exciting new directions of public-key cryptology. The book is fun to read, and the author presents the material clearly and simply. Many exercises and references accompany each chapter. |

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able additive ciphers algorithm alphabet anonymity answer applies asymmetric attack authentication bank bits called cell chapter choose chosen cipher cipher system ciphertext cleartext coin common consider consists convince corresponding course cryptanalyst cryptographic cryptology decipher described difficult discuss easy electronic enciphering encryption English equal example exchange exercise fact factor Figure frequency function give hand important instance integers keyword known least length letters linear look mathematical means method monoalphabetic cipher Note observation obtain pair participant particular password perfect positive possible present prime probability problem procedure protocol prove public key question random reason recipient relatively result scheme secret key sender sequence shift register shows signature simply smart card square symbols transformations verify wants Write