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Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  cipher, cypher(noun) a message written in a secret code. 2  zero, 0, nought, cipher, cypher(noun) a mathematical element that when added to another number yields the same number.
Encryption. Traditionally, ciphers have used information contained in secret decoding keys to code and decode messages. The process of coding plaintext to create ciphertext is called encryption and the process of decoding ciphertext to produce the plaintext is called decryption. Modern systems of electronic cryptography use digital keys (bit strings) and mathematical algorithms (encryption algorithms) to encrypt and decrypt information.