Jefferson cipher table

Jefferson cipher table

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Credit: SCIENCE PHOTO LIBRARY

Caption: Jefferson cipher table. This table was used to decipher the code presented on a Jefferson disk, an encryption instrument consisting of 26 numbered wheels, each with the letters of the alphabet arranged randomly around them. It was first invented by Thomas Jefferson in 1795 but did not become well-known until it was independently invented a century later by the French military cryptanalyst Commandant Etienne Bazeries. The Bazeries cylinder was then refined into the US Army's M-94 cryptograph, which was used from 1922 to 1945.

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