In communications and information processing, encoding is a system of rules to convert information—such as a letter, word, sound, image, or gesture—into another form or representation, sometimes shortened or secret, for communication through a channel or storage in a medium.

The process of encoding converts information from a source into symbols for communication or storage. Decoding is the reverse process, converting code symbols back into a form that the recipient understands.

A Caesar cipher, also known as Caesar's code, 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 X-shifted letter in the alphabet.

** Cipher with a shift of X=3**

Source: Wikipedia (license)

External resources

Caesar cipherEncoding