Encode and decode messages using the classic Caesar cipher or the enhanced rolling cipher extension.
Basic Caesar Cipher: Each letter in the message is shifted by the same key value. For example, with a key of 3: A → D, B → E, C → F, etc.
The Caesar cipher is one of the simplest encryption techniques. It works by shifting each letter in the plaintext by a fixed number of positions down the alphabet.
Encoding: Letters are shifted forward by the key value.
Decoding: Letters are shifted backward by the key value.
Non-alphabetic characters (spaces, punctuation, numbers) remain unchanged.
The Rolling Cipher extension increases security by changing the shift for each letter, making it harder to crack through frequency analysis.