Codes Ciphers Encryption and Cryptography - Braingle

Braingle: Codes, Ciphers, Encryption and Cryptography:

Cryptography is the discipline of using codes and ciphers to encrypt a message and make it unreadable unless the recipient knows the secret to decrypt it. Encryption has been used for many thousands of years. The following codes and ciphers can be learned and used to encrypt and decrypt messages by hand.