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NSA encryption systems
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== Sources == {{Commons category|NSA encryption devices}} * [https://www.nsa.gov/ NSA official site] * [http://www.jproc.ca/crypto/ Jerry Proc Crypto machine page] * [http://www.pacificsites.com/~brooke/I/CryptoM.shtml Brooke Clarke Crypto machines site] {{Webarchive|url=https://web.archive.org/web/20160304024849/http://www.pacificsites.com/~brooke/I/CryptoM.shtml |date=2016-03-04 }} * [http://www.designation-systems.net/usmilav/miscsystems.html#_TSEC Telecommunications Security (TSEC) Nomenclature System] * [https://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]
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