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.
Create a custom alphabet here.
The Beaufort cipher uses the following tableau (the 'tabula recta') to encipher the plaintext: