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
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- 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.
The ciphertext above represents "SIR FRANCIS BEAUFORT" encrypted using the key CRYPTO.
See also: Code-Breaking overview | Adfgvx cipher | Adfgx cipher | Atbash 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