This publication consists of a series of lectures prepared and given to interns and other employees by Mr. David G. Boak in 1966. Mr. Boak is uniquely qualified to discuss the history of U.S. COMSEC because he has participated significantly in most aspects of its modem development over the past twenty years.
The purpose of these lectures was to present in an informal yet informative manner the fundamental concepts of Communications Security and to provide an insight into the strengths and weaknesses of selected manual systems, electro-mechanical and electronic crypto-equipments..
***Declassified***
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