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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 machines are known as the C-machines, or
pin-and-lug cipher machines [1].
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© Crypto Museum. Created: Wednesday 17 February 2021. Last changed: Tuesday, 26 September 2023 - 07:16 CET.
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