What is the Caesar Cipher?

The Caesar cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.

How It Works

For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.

Practice Time!

Let's encrypt "HELLO" with a shift of 3.

H -> K

E -> H

L -> O

L -> O

O -> R

So, "HELLO" becomes "KHOOR".