A History of U.S. Communications Security

[Pehr Söderman]

Freshly declassified and a rather interesting read:

A History of U.S. Communications Security (Volumes I and II, 1973)
David G. Boak Lectures, National Security Agency (NSA)

http://www.governmentattic.org/2docs/Hist_US_COMSEC_Boak_NSA_1973.pdf

(From Bruce Schneier/Governmentattic)

/Pehr Söderman

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