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polyalphabetic substitution
[ pol-ee-al-fuh-bet-ik suhb-sti-too-shuhn, ‐tyoo-shuhn, pol-ee- ]
/ ˈpɒl iˌæl fəˈbɛt ɪk ˌsʌb stɪˈtu ʃən, ‐ˈtyu ʃən, ˌpɒl i- /
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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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Compare monoalphabetic substitution.
Origin of polyalphabetic substitution
1935–40; poly- + alphabetic
Words nearby polyalphabetic substitution
polyacrylonitrile, polyadelphous, polyadenylic acid, polyadic, polyalcohol, polyalphabetic substitution, polyamide, polyamine, polyamorous, polyamory, polyandric
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023