Book: Stream Ciphers and Number Theory
Author: Thomas W.Cusick, Cunsheng Ding, Ari Renvall
Pages: 446
Format: PDF
Language: English
ISBN10: 0444828737
The goal of cryptography is the concealment of messages in such a way that only authorized people can read them. A cipher or cryptosystem is an algorithm for carrying out this concealment. If a message M is represented as a string of characters m l, m2, ... from some fixed character set or alphabet, then a cipher consists of two processes: encryption, a method for converting the message or plaintext into a ciphertext meant to be unreadable by unauthorized people; and decryption, a method for recovering the message from the ciphertext.
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