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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.
Transposition Cipher A transposition cipher changes the position of characters in the plain text message. It is also referred to as an anagram . Substitution Cipher A substitution cipher replaces one set of characters with symbols or another character set. This type of cipher is subject to frequency attacks. Substitution cipher uses the following: A code substitutes hidden words with unrelated terms. A cipher or algorithm is the process or formula used to convert a message or otherwise hide its meaning.