Note: This is the VARIANT Beaufort Cipher, not to be confused with the common Beaufort Cipher.
In the (German) variant Beaufort cipher, encryption is performed like decryption in the Vigenère cipher, and decryption is performed like encryption in the Vigenère cipher. The variant Beaufort cipher is a polyalphabetic cipher, a series of Caesar ciphers, based on the letters of a keyword.
Variant Beaufort Cipher Tool
Knowing the encryption key
Not knowing the key
Still not seeing the correct result? Then try experimenting with the Auto Decode settings or use the Cipher Identifier Tool.
- The variant Beaufort cipher is a polyalphabetic substitution cipher.
- The name comes from Sir Francis Beaufort, an Irish officer in the Royal Navy, although the cipher is actually an inverted Vigenère cipher.
- In variant Beaufort, encryption is performed like the decryption step of the standard Vigenère cipher, and similarly, decryption is performed like the Vigenère encryption.
- The variant Beaufort cipher is also called German variant Beaufort cipher.
Beaufort ciphers, and variants of it, are occasionally used in CTFs, geocaching mystery caches, and logic puzzles.
Sample Variant Beaufort Cipher
Code-breaking is not only fun, but also a very good exercise for your brain and cognitive skills. Why don’t you try breaking this example cipher:
iw oyug nkqzovt ckfd bcvyz efkzivo witu ujiu bcv mqxbul rzjkc nqa nf qvbio ecvd acv iir yuz wcqkf sumn zd tdkjtz yuikj bqfv vqiv swvc jpvk ipz jjihgul cvh njfj iiu jwmv xmm yqqm rdl beqacvt pzi jmzkx
See also: Code-Breaking overview | Adfgvx cipher | Adfgx cipher | Affine cipher | Atbash cipher | Baconian cipher | Beaufort cipher | Bifid cipher | Caesar cipher | Columnar transposition | Cryptogram | Double transposition | Enigma machine | Four-square cipher | Gronsfeld cipher | Keyed caesar cipher | One-time pad | Pigpen cipher | Playfair cipher | Rail fence cipher | Rot13 | Trifid cipher | Vigenere cipher