Beaufort Cipher

The Beaufort cipher, created by Sir Francis Beaufort, is a polyalphabetic substitution cipher that is similar to the Vigenère cipher, only that instead of adding letter values, it calculates the cipherletter by taking the keyletter minus the plaintextletter.

This tool supports both a standard and autokey cipher mode.

You must enter the plaintext.
Encryption Key
You must enter the encryption key.

Cipher Mode

Alphabet Key
Create a custom alphabet here.

You must enter the ciphertext.

The Beaufort cipher uses the following tableau (the 'tabula recta') to encipher the plaintext: