A device or apparatus used for encoding and decoding secret messages, or the encoded message itself.
From Greek 'kryptos' (hidden) and 'graph' (write or recording device), this term emerged in the 19th century alongside mechanical encryption devices like the Enigma machine.
Thomas Jefferson invented a cryptograph called the 'Jefferson Disk'—a cylinder with rotating wheels that was so advanced it was still classified by the U.S. military well into the 20th century.
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