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Variant Beaufort Cipher

Tool to decrypt/encrypt with Beaufort Variant automatically. Variant Beaufort Cipher is a (German) variant of the Beaufort Cipher. The variant subtract the key to the plaintext.

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Variant Beaufort Cipher -

Tag(s) : Cryptography,Poly-Alphabetic Cipher

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Variant Beaufort Cipher

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Variant Beaufort Decoder












Also on dCode: Beaufort CipherVigenere Cipher

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Also on dCode: Beaufort CipherVigenere Cipher

Tool to decrypt/encrypt with Beaufort Variant automatically. Variant Beaufort Cipher is a (German) variant of the Beaufort Cipher. The variant subtract the key to the plaintext.

Answers to Questions

How to encrypt using Variant Beaufort cipher?

Encryption is a variant of the Beauforthref cipher, itself being a variant of Vigenerehref, so 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 subtracting the key to the plain text. 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 repeated as necessary in order that it fits the length of the plain text : KEYKEYKEYK...

One subtracts the first letter of the key K (=10) to the first letter of the plain message D (=3) : 3-10=-7. As the result is negative, you add 26. -7+26=19. 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 : 2-4=-2+26=24. One keeps going with the third letters O and Y : 14-24=-10+26=16. 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 first letter of the key K (where K is the 4th letter of the key if it has been repeated) to the 4th letter of the plaintext D : 3-10=-7+26=19, 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.

19,24,16,19,0 becomes with 19:T, 24:Y, 16:Q, 19:T, 0:A, the cipher message TYQTA.

How to decrypt Variant Beaufort cipher?

With the Variant Beauforthref cipher one adds the message to the key, this is equivalent to encoding with Vigenerehref.

How to recognize Variant Beaufort ciphered text?

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

How to decipher Variant Beaufort without key?

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

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Source code

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