mono-alphabetic substitution

monoalphabetic substitution

[mon-oh-al-fuh-bet-ik, mon-oh-]
noun Cryptography.
a system of substitution that uses only one cipher alphabet in a cryptogram so that each plaintext letter is always represented by the same cipher.

1935–40; mono- + alphabetic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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