˜yÐÄvlog

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polyalphabetic substitution

[ pol-ee-al-fuh-bet-ik suhb-sti-too-shuhn, â€-tyoo-shuhn, pol-ee- ]

noun

Cryptography.
  1. a system of substitution that mixes together a number of cipher alphabets in a cryptogram so that each plaintext letter is represented by a cipher that repeatedly changes.
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˜yÐÄvlog History and Origins

Origin of polyalphabetic substitution1

1935–40; poly- + alphabetic ( def )

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