the earliest known, and simplest use, of a substitution cipher was called the __________ cipher and involved replacing each letter of the alphabet with the letter standing three places further down the alphabet.

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The Answer of the earliest known, and simplest use, of a substitution cipher was called the __________ cipher and involved replacing each letter of the alphabet with the letter standing three places further down the alphabet.

The Earliest Known, and Simplest Use, of a Substitution Cipher