How to Write and Decode Top-Secret Messages (Codemaster, No. 1)
By Marvin Miller.
Description
From Wikipedia: In cryptography, a code is a method used to transform a message into an obscured form so it cannot be understood. Special information or a key is required to read the original message. The usual method is to use a codebook with a list of common phrases or words matched with a codeword. Encoded messages are sometimes termed codetext, while the original message is usually referred to as plaintext. ~~~ Terms like code and in code are often used to refer to any form of encryption. However, there is an important distinction between codes and ciphers in technical work; it is, esse...
ISBN(s)
0439627176, 9780439627177
