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monoalphabetic substitution

American  
[mon-oh-al-fuh-bet-ik suhb-sti-too-shuhn, mon-oh-] / ˈmɒn oʊˌæl fəˈbɛt ɪk ˌsʌb stɪˈtu ʃən, ˌmɒn oʊ- /

noun

Cryptography.

  1. 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.

Etymology

Origin of monoalphabetic substitution

1935–40; mono- + alphabetic ( def. )

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

They were both fans of the monoalphabetic substitution cipher.”

From "Book Scavenger" by Jennifer Chambliss Bertman

They were both fans of the monoalphabetic substitution cipher.”

From "Book Scavenger" by Jennifer Chambliss Bertman

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.