plural of substitution cipher

plural of Feistel cipher

plural of block cipher

plural of Caesar cipher

plural of Vigenère cipher

plural of stream cipher

plural of Playfair cipher

A simple form of encryption in which each letter in the plaintext is shifted through the alphabet a number of positions (for example A→D, B→E, C→F, etc.).

(cryptography) A method of encryption by which units of plaintext are substituted with ciphertext according to a regular system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing an inverse substitution.

(cryptography) a symmetric-key cipher in which plaintext digits are combined with a pseudorandom cipher digit stream