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The Vigenere cipher uses a index table ("Tabula Recta") for encryption, where it takes columns values for the plaintext and rows values for the key, returning the cell which content becomes the ciphered character. The Beaufort Cipher slightly differs from the Vigenere as it uses corresponding cell value for the key, and returns the rows values as crypted chars.

Example :

• Using the table above, take the column corresponding to the plaintext letter i : T
• Take the row corresponding to the key letter i : C
• The letter in that cell gives the crypted value: V

• Take the row corresponding to the key letter C
• Find the cell of that row containing the crypted value V
• Return the column of that value, giving the original plaintext : in this case, T

Encrypter

Decrypter