Polyalphabetic-substitution
[pol-ee-al-fuh-bet-ik, pol-ee-] /ˈpɒl iˌæl fəˈbɛt ɪk, ˌpɒl i-/
noun, Cryptography.
1.
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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