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substitution cipher

noun

, Cryptography.
  1. a cipher that replaces letters of the plain text with another set of letters or symbols.


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Word History and Origins

Origin of substitution cipher1

First recorded in 1935–40
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Example Sentences

Then why didn't the Germans use a substitution cipher when they sent this message about the transports?

That brought the message down to the simple and straightforward matter of a substitution cipher.

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