## 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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additive ciphers affine cipher alphabet anonymity applies asymmetric attack bank binary bits chapter choose chosen cipher system ciphertext letter ciphertext symbols cleartext letter coin consists convince corresponding ciphertext course cryptanalyst cryptographic cryptology DA(m denote described digits discrete logarithms enciphering encryption scheme English Euclidean algorithm example exercise fact factor Figure frequency Hint index of coincidence instance integers Kasiski test key exchange keyword linear shift register mailbox mathematical mathematician method modp monoalphabetic cipher multiplicative obtain one-time pad one-way function participant password perfect polyalphabetic cipher positive integers possible prime numbers private key probability problem procedure random number randomly recipient register of length relatively prime RSA algorithm scytale secret key sender sequence of letters shopkeeper simply smart card square roots symmetric algorithm theorem transformations transmitted transposition cipher user authentication verify Vigenere cipher wants words Write a program