substitution cipher

noun

Definition of substitution cipher

: a cipher in which the letters of the plaintext are systematically replaced by substitute letters — compare transposition cipher

Examples of substitution cipher in a Sentence

Recent Examples on the Web Related Stories To solve the first two passages, codebreakers used vigenere, which is what cryptologists call a polyalphabetic substitution cipher system. Courtney Linder, Popular Mechanics, "Nobody Has Solved This Cryptographic Puzzle for 30 Years. Think You Can?," 3 Feb. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'substitution cipher.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of substitution cipher

1936, in the meaning defined above

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Time Traveler for substitution cipher

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The first known use of substitution cipher was in 1936

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Cite this Entry

“Substitution cipher.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/substitution%20cipher. Accessed 25 Nov. 2020.

More from Merriam-Webster on substitution cipher

Britannica.com: Encyclopedia article about substitution cipher

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