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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.
Ciphertext can also be referred as encrypted text. Before encryption we had plaintext. The term cipher is sometimes used as an alternative term for ciphertext. In cryptography, cipher is an algorithm that is applied on the plain text to get the ciphertext. Another name for ciphertext is encrypted or encoded information because it is unreadable by a human or computer without the proper algorithm.