Codes

Codes and Ciphers in the National Security Context

A definition and brief description of Codes and Ciphers in relation to national security is as follows:Forms of cryptography, a term from the Greek kryptos, hidden, and graphia, writing. Both transform legible messages into series of symbols that are intelligible only to specific recipients. Codes do so by substituting arbitrary symbols for meanings listed in a codebook; ciphers do so by performing rule-directed operations directly on original message text.