Image: NSA DIANA one time padf

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Description: A format of one-time pad used by the U.S. National Security Agency, code named DIANA. The table on the right is an aid for converting between plain txt and cipher text using the characters at left as the key. The black circle is an artifact of copying, due to a hole punched in the original.
Title: NSA DIANA one time pad
Credit: http://www.governmentattic.org/18docs/Hist_US_COMSEC_Boak_NSA_1973u.pdf A History of U.S. Communications Security; the David G. Boak Lectures, National Security Agency (NSA), Volumes I, 1973, Volumes II 1981, partially released 2008, additional portions declassified October 14, 2015
Author: US National Security Agency
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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