definitions

polyalphabetic substitution

[ pol-ee-al-fuh-bet-ik, pol-ee- ]
/ ˈpɒl iˌæl fəˈbɛt ɪk, ˌpɒl i- /

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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Nearby words

polyadenitis, polyadenopathy, polyadenylic acid, polyadic, polyalcohol, polyalphabetic substitution, polyamide, polyamine, polyamorous, polyamory, polyandric
Compare monoalphabetic substitution.

Origin of polyalphabetic substitution

1935–40; poly- + alphabetic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019