Classical ciphers | Cryptographic algorithms

Beaufort cipher

The Beaufort cipher, created by Sir Francis Beaufort, is a substitution cipher similar to the Vigenère cipher, with a slightly modified enciphering mechanism and tableau. Its most famous application was in a rotor-based cipher machine, the Hagelin M-209. The Beaufort cipher is based on the Beaufort square which is essentially the same as a Vigenère square but in reverse order starting with the letter "Z" in the first row, where the first row and the last column serve the same purpose. (Wikipedia).

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http://www.mekanizmalar.com/variable_displacement_piston_pump.html

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Related pages

Modular arithmetic | Atbash | Vigenère cipher | Substitution cipher