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.

Boxentriq puzzle promotion

Variant Beaufort Cipher Tool

You must enter the message.

Knowing the encryption key

You must enter the encryption key.

Not knowing the key


Not seeing the correct result? Try Auto Decode or use the Cipher Identifier Tool.

Key Text

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