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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.
Origin of polyalphabetic substitution
1935-40; poly- + alphabetic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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