Playfair cipher

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• Playfair cipher — The Playfair cipher or Playfair square is a manual symmetric encryption technique and was the first literal digraph substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair who promoted the… …   Wikipedia

• playfair cipher — noun Usage: usually capitalized P Etymology: after Lyon, Baron Playfair died 1898 British scientist & public official : a cipher involving a digraphic substitution from a single alphabet square which begins with the letters of a keyword and… …   Useful english dictionary

• Playfair — Real people= Playfair is a surname, and may refer to* Andrew W. Playfair (1790–1868), Canadian politician, son of William * Henry Playfair (born 1983), Australian rules footballer * Ian Stanley Ord Playfair (1894 1972), a general in the British… …   Wikipedia

• Substitution cipher — In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the units may be single letters (the most common), pairs of letters, triplets of letters,… …   Wikipedia

• Four-square cipher — The Four square cipher is a manual symmetric encryption technique. It was invented by famous French cryptographer Felix Delastelle.The technique encrypts pairs of letters ( digraphs ), and thus falls into a category of ciphers known as… …   Wikipedia

• Hill cipher — Hill s cipher machine, from figure 4 of the patent In classical cryptography, the Hill cipher is a polygraphic substitution cipher based on linear algebra. Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was… …   Wikipedia

• Two-square cipher — The Two square cipher is a manual symmetric encryption technique. It was developed to ease the cumbersome nature of the large encryption/decryption matrix used in the four square cipher while still being slightly stronger than the Playfair cipher …   Wikipedia

• Lyon Playfair, 1st Baron Playfair — Lyon Playfair, 1st Baron Playfair, GCB, PC, FRS (May 1, 1818 ndash; May 29, 1898) was a Scottish scientist and Parliamentarian.Born at Chunar, Bengal, son of the Inspector General of Hospitals in that region, Playfair was educated at the… …   Wikipedia

• National Cipher Challenge — The National Cipher Challenge is an annual cryptographic competition organised by the University of Southampton School of Mathematics. Competitors attempt to break cryptograms published on the competition website. In the 2007/08 challenge, 1301… …   Wikipedia

• Bifid cipher — In classical cryptography, the bifid cipher is a cipher which combines the Polybius square with transposition, and uses fractionation to achieve diffusion. It was invented around 1901 by Felix Delastelle. Operation First, a mixed alphabet… …   Wikipedia

• Caesar cipher — The action of a Caesar cipher is to replace each plaintext letter with one fixed number of places down the alphabet. This example is with a shift of three, so that a B in the p …   Wikipedia