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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.
Definition of:encryption algorithm. A formula used to turn ordinary data, or plaintext, into a secret code known as ciphertext.. Each algorithm uses a string of bits known as a key to perform the calculations. The larger the key (the more bits), the greater the number of potential patterns can be created, thus making it harder to break the code and descramble the contents.