substitution cipher

(redirected from Monoalphabetic substitution)

substitution cipher

[‚səb·stə′tü·shən ‚sī·fər]
(communications)
A cipher in which the characters of the original message are replaced by other characters according to a key.
References in periodicals archive ?
The Caesar cipher, a monoalphabetic substitution, is extremely weak, requiring only that all possible displacements of one to twenty-five letters are tested until meaningful plaintext becomes obvious.