polyalphabetic substitution
[ pol-ee-al-fuh-bet-ik suhb-sti-too-shuhn, ‐tyoo-shuhn, pol-ee- ]
nounCryptography.
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
11935–40; poly- + alphabetic
- Compare monoalphabetic substitution.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
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