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Beaufort Cipher
Substitution cipher - this page is a stub

The Beaufort Cipher is a polyalphabetic substitution cipher, created by British rear admiral Sir Francis Beaufort (1771-1857) [2]. It is based on the Vigenère Cipher, but uses a reversed output alphabet. This makes the cipher reciprocal (reversible). Exactly when it was created is unknown. Beaufort used it for his personal correspondence and diary, and the method was disclosed after his death in 1857, by his brother. There are indications however that it dates back to 1710 [3].

Based on the Vigenère Cipher – which itself is based on the Caesar Cipher – the Beaufort Cipher is also known a the Reverse Caesar Cipher. A good example of the use of the Beaufort Cipher, is its application between 1935 and 1965 in a series of cipher machines, developed by the Swede Boris Hagelin. These machinea are known as the C-machines, or pin-and-lug cipher machines [1].


References
  1. Wikipedia, Beaufort cipher
    Retrieved February 2021.

  2. Wikipedia, Francis Beaufort
    Retrieved February 2021.

  3. dCode, Beaufort Cipher
    Retrieved February 2021.
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Crypto Museum. Created: Wednesday 17 February 2021. Last changed: Wednesday, 17 February 2021 - 19:18 CET.
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