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polyalphabetic substitution: Meaning and Definition of
pol'y•al•pha•bet'ic substitu'tion
Pronunciation: (pol'ē-al"fu-bet'ik, pol"ē-), [key]
— Cryptography. 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. Cf.
