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Military Cryptanalysis : Simpler Varieties of Aperiodic Substition Systems

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The first part of this text will be devoted to an examination of certam of the
very simple varieties of aperiodic, polyalphabetic subsstitionon systems,
after this, methods of extending or lengthenmg short mnemornic keys,
and systems using lengthy keys will be studied.

--NSA DECLASSIFIED MATERIAL--

207 pages, Kindle Edition

Published August 18, 2016

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Nsa

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