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substitution cipher
noun
: a cipher in which the letters of the plaintext are systematically replaced by substitute letters compare transposition cipher
Example Sentences
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, 3 Feb. 2020
Courtney Linder, Popular Mechanics, 3 Feb. 2020 Word History
First Known Use
1936, in the meaning defined above
Time Traveler
The first known use of substitution cipher was in 1936 👨🏻🏫 Mr. Ng 韋氏詞典 📚 – mw.mister5️⃣.net
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