polyalphabetic substitution cipher
(redirected from Polyalphabetic cipher)Also found in: Wikipedia.
polyalphabetic substitution cipher
[‚päl·ē‚al·fə′bed·ik ‚səb·stə′tü·shən ‚sī·fər] (communications)
A cipher that uses several substitution alphabets in turn.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.