Caesar Cipher

The Caesar cipher is one of the earliest known and simplest ciphers.
Create your own Caesar cipher messages:
1) Use custom shift from 1-26
2) Encrypt, decrypt ROT13
3) Use brute-force attack to crack Caesar messages with unknown shift
4) Copy/paste messages from/to other apps

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. 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.