8.14 Cryptography
INTRODUCTION
The word cryptography is a combination of two Greek words: crypto, meaning “hidden” or “secret,” and grapho, which means “writing.” Cryptography then is the study of making “secret writings” or codes.
In this section we will consider a system of encoding and decoding messages that requires both the sender of the message and the receiver of the message to know:
- a specified rule of correspondence between a set of symbols (such as letters of the alphabet and punctuation marks from which messages are composed) and a set of integers; and
- a specified nonsingular matrix A.
Encoding/Decoding
A natural correspondence ...
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