... Description of document: A History of U.S. Communications Security (Volumes I and II); the David G. Boak Lectures, National Security Agency, 19... ...ription of document: A History of U.S. Communications Security (Volumes I and II); the David G. Boak Lectures, National Security Agency, 1973 Req... ...our request of 23 December 2007 to have A History of U.S. Communications Security (2 volumes) by David G. Boak, Fort George G. Meade, MD National Secu... ...lication CODSiats or. aeri. or lectures prepazed aDd liven to iDtema aDd other DlploytllS by Mr. David G. Boak iD 1966. Mr. Boak it UDiquely qua1i6ed ... ...e traditional defini­ tion of them is: Code: "A substitution cryptosystem in which the plaintext elements are primarily words, phrases, or sentences, ... ...locic clouary baa defiDed a code in terms of the meaning-or meaningfulneu-oftheUDderl~ingteztual elements. I wouldn't push the diatinction too far-it ... ...n old-fashioned mimlg device is a bank of magnet-actuated relays that open and close to form the elements of teletypewriter characters being processed... ...ss. The trouble was tbat there was no other Government Apncypre~ to accept such a role. The Army Chemical Corps bad provided the orilinal pyrotcebDic ... ... on. One such CIIe iD'OMd In OpeJ8tional T.S. key lilt beJna examined for latent prints in In S2 chemical lab. When the cloculDCllt W8I placed on a be...

...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 the US COM_SEC because he has participated significantly in most aspects of its modern development over the past twenty years....