50 - 60 B.C. - Julius Caesar
Julius Caesar Bust Statue
Julius Caesar's simple substitution cipher. This type of encryption is one of the simplest and most widely known encryption
techniques. Each letter of the plaintext is replaced by a letter some fixed number of positions further down the alphabet.
For example, a shift of 4 would move A to E, B to F, etc. Such as:
Plain: abcdefghijklmnopqrstuvwxyz
Cipher: DEFGHIJKLMNOPQRSTUVWXYZABC
The Caesar cipher is named after Julius Caesar, who, according to Suetonius, used it with a shift of three to protect messages
of military significance.
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