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Caesar cipher (ROT13)

Below three different alphabets can be used: ROT5, concerning the 10 digits, ROT13, concerning all 26 letters, and ROT47, concerning all ascii characters from 33 up to 126. The methods are named after the default number of rotations, respectively 5, 13 and 47. The other rotations are also available. A variation to the standard Caesar cipher can be used by entering the alphabet key.
With all settings the corresponding (de-)coding key will be shown.

Alphabet:
Rotate # places:
Show all rotations:
Use alphabet key:
Method:


Key
Original:  abcdefghijklmnopqrstuvwxyz
Substitution:  nopqrstuvwxyzabcdefghijklm
Background

The Caesar cipher or shift cipher method uses a simple substitution encryption. This means that every character is substituted by another character according to a specific system. The substitution character is determined by rotating the alfabet. For example, the wel known and mostly used ROT13 method shifts the alphabet with 13 positions, this results in: A=>N, B=>O, ...,Y=>L and Z=>M. Every other shift is also possible. In the exceptional case of the ROT13 method with 13 rotations the same key can be used for encryption and decryption. This does not work for the other shifts, keep this in mind.
A variation to the standard Caesar cipher uses a key word or alphabet key to alter the alphabet. The characters of the key word are added to the beginning of the substitution alphabet and removed from their original location. Needles to say, every character is still used only once in the alphabet, although they may be used more than once in the key word.

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