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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.
The encryption algorithm is the chain of calculations that determine what ways the input plain text will be transformed into the output ciphertext. In the simple example above there was only one calculation carried out, which moved each letter of the message one forward in the alphabet.