Chapter 17
Encryption and Decryption
17.1 Models, Goals, and Early Cipher Systems
17.1.1 A Model of the Encryption and Decryption Process
The desire to communicate privately is a human trait that dates back to earliest times. Hence the history of secret communications is rich with unique inventions and colorful anecdotes [1]. The study of ways to disguise messages so as to avert unauthorized interception is called cryptography. The terms encipher and encrypt refer to the message transformation performed at the transmitter, and the terms decipher and decrypt refer to the inverse transformation performed at the receiver. The two primary reasons ...
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