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.

Question

Quizplus · Accepted Answer

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