Beaufort cipher

noun
Beau·​fort cipher | \ˈbō-fərt-\

Definition of Beaufort cipher 

: a system of polyalphabetic substitution equivalent to Vigenère cipher with a reversed normal cipher sequence, the keying formula of which is P + C=K

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History and Etymology for Beaufort cipher

after Sir Francis Beaufort †1857 English naval officer and hydrographer

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