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The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher. The scheme was invented in 1854 by Charles Wheatstone , but bears the name of Lord Playfair for promoting its use.
In 1914 he published the first recorded solution of the Playfair cipher. Mauborgne became a Major General in the United States Army , and from October 1937 to his retirement in 1941 was the Army's 12th Chief Signal Officer, in command of the Signal Corps .
In this cipher, a 5 x 5 grid is filled with the letters of a mixed alphabet (two letters, usually I and J, are combined). A digraphic substitution is then simulated by taking pairs of letters as two corners of a rectangle, and using the other two corners as the ciphertext (see the Playfair cipher main article for a diagram). Special rules ...
The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique. [1] 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 single-square Playfair cipher .
The Playfair cipher, the first literal digraph substitution cipher, is invented by Charles Wheatstone and later promoted for use by Lord Playfair. [37] 1868. Mushet steel, the first commercial steel alloy, is invented by Robert Forester Mushet. Thomas Humber develops a bicycle design with the pedals driving the rear wheel.
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Playfair (surname) Playfair (lunar crater) Playfair (Martian crater) PlayFair, software that removes Apple's FairPlay DRM file encryption, now succeeded by Hymn; Playfair Project; TS Playfair, a Canadian sail training vessel; Playfair's axiom named after John Playfair; Playfair cipher, a manual encryption technique invented in 1854 by Charles ...
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