Variant Beaufort cipher decoder and encoder

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.

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Decode variant Beaufort cipher

Note that you can type in either the ciphertext or plaintext area.

Decryption/encryption settings

Features

  • 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 text

QRTQYMLLKDIQYDHZYF

The ciphertext above represents "SIR FRANCIS BEAUFORT" encrypted using the key CRYPTO.