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Date: 2009-01-13 11:14:22Rotor machines KW-26 Communications security 5-UCO National Security Agency Gilbert Vernam Fill device Howard Barlow One-time pad Cryptography Cyberwarfare Espionage | Add to Reading ListSource URL: www.nsa.govDownload Document from Source WebsiteFile Size: 1.012,54 KBShare Document on Facebook |