Enter message to be encrypted or decrypted
Simple Caesar Shift Cipher
will be substituted for the letter A. This letter is the key that locks (encrypts) the message and the key that will unlock (decrypt) the message.
The simple encryption method uses what is called a monoalphabet substitution cipher. It is probably the first cipher to have been devised. It is called a Caesar shift cipher as the technique used to encrypt and decrypt the message was known to have been used by Julius Caesar. In the cipher used by Julius Caesar, he simply replaced one letter of plain text with a letter shifted by three places. Using our modern Latin alphabet, the letter 'I' would be replaced by the letter 'L'. So, as an example, the encryption of JULIUS CAESAR would be MXOLXV FDHVDU. Of course, we do not have to always shift the letters by three places. Using just the uppercase alphabet, we can shift it by 1 to 25 places. If we had used a shift of four places, the encryption of JULIUS CAESAR would be NYPMYW GEIWEV. More on the
Ceasar Shift Cipher