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Beaufort Cipher

Tool to decrypt/encrypt with Beaufort automatically. Beaufort Cipher is a variant of the Vigenere Cipher: rather than add the key to the plaintext, Beaufort subtract the plaintext to the key.

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Beaufort Cipher -

Tag(s) : Cryptography,Poly-Alphabetic Cipher

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Beaufort Cipher

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Also on dCode: Vigenere Cipher

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Also on dCode: Vigenere Cipher

Tool to decrypt/encrypt with Beaufort automatically. Beaufort Cipher is a variant of the Vigenere Cipher: rather than add the key to the plaintext, Beaufort subtract the plaintext to the key.

Answers to Questions

How to encrypt using Beaufort cipher?

Encryption is a variant of the Vigenere cipherhref, it uses a key (and an alphabet).

Let the plain text be DCODE, the key KEY and the latin alphabet ABCDEFGHIJKLMNOPQRSTUVWXYZ

For each letter corresponds the value of its rank in the alphabethref starting from 0=A,1=B,...,25=Z

DCODE corresponds to 3,2,14,3,4 and KEY to 10,4,24

Encryption consists in substracting the plain text to the key. Calculation is made letter after letter (one does not subtract letters but they associated value in the alphabet).
If the result is negative, add 26 to the result (where 26 is the length of the alphabet).
The key is repeater as necessary in order that it fits the length of the plain text : KEYKEYKEYK...

One subtracts the first letter of the plain message D (=3) to the first letter of the key K (=10) : 10-3=7. One keeps this result and continues with the next letters : the second letter of the plain message C and the second letter ot the key E : 4-2=2. One keeps going with the third letters O and Y : 24-14=10. At the 4th step, one arrives at the end of the key, so we repeat the key (or one goes to the beginning, its the same), one subtracts the 4th letter of the plaintext D to the first letter of the key K (where K is the 4th letter of the key if it has been repeated) : 10-3=7, and to finish E and E so 4-4=0.

Each result is a number between 0 and 25, to which one make a correspondence with a letter of the same rank in the alphabethref in order to get the cipher text.

7,2,10,7,0 becomes with 7:H, 2:C, 10:K, 7:H, 0:A, the cipher message HCKHA.

How to decrypt Beaufort cipher?

The Beaufort cipher has for particularity that the decryption is identical to the encryption: one subtract the cipher message to the key.

How to recognize Beaufort ciphered text?

The ciphered message has an indice of coincidence between 0.4 and 0.5, generally smaller than the one of the language of the plain text.

How to decipher Beaufort without key?

Techniques to decode Beaufort are similar to the ones for Vigenerehref. dCode can analyse the text in order to find the probable key lengths (Kasiski, etc.) and uses frequency analysishref techniques to find the key.

What are the variants of the Beaufort cipher?

Beaufort is already a variant of Vigenerehref. Where Vigenerehref adds the message to the key, Beaufort subtract the message to the key. The German variant for Beaufort subtract the key to the message.

When Beaufort have been invented?

Sir Francis Beaufort, british amiral made this method published after his death by its brother in 1857. However, some writings indicate that this variant was known since 1710.

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Source code

dCode retains ownership of the source code of the script Beaufort Cipher. Except explicit open source licence (free / freeware), any algorithm, applet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any snippet or function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in PHP (or Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the Beaufort Cipher script for offline use, for you, your company or association, see you on contact page !

Questions / Comments


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