a cipher that replaces letters of the plain text with another set of letters or symbols.
- Compare transposition cipher.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use substitution cipher in a sentence
Then why didn't the Germans use a substitution cipher when they sent this message about the transports?The Secret Wireless | Lewis E. Theiss
That brought the message down to the simple and straightforward matter of a substitution cipher.