polyalphabetic substitution cipher

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.
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Holden goes on to explore polyalphabetic substitution ciphers, transposition ciphers, including one developed by the Spartans, connections between ciphers and computer encryption, stream ciphers, and ciphers involving exponentiation.