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polyalphabetic substitution
[pol-ee-al-fuh-bet-ik suhb-sti-too-shuhn, pol-ee-, ‐-tyoo-shuhn]
noun
Cryptography.
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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Word History and Origins
Origin of polyalphabetic substitution1
1935–40; poly- + alphabetic ( def. )
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