One of the simplest methods to create secret messages is undoubtedly the Caesar Cipher.
As you might expect, it’s named after Julius Caesar, who used it in his correspondence.
To encipher a message, we choose a whole number and shift every letter down the alphabet by that number of places.
For example, if we choose 3 then B becomes E, M becomes P, and Y becomes B; after Z we start at A again.
To decipher the message, we just shift the letters back again.
ABCDEFGHIJKLMNOPQRSTUVWXYZ : Plain
DEFGHIJKLMNOPQRSTUVWXYZABC : Cipher
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