MEMO ROUTING s~Ff 

ORGANIZATION AND LOCATION 

2 

3 

4 

REMARKS -" I 

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COORDINATION 

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SIGNATURE 

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on 05-19-2014 

Replaces DA AGO Form 895, J Apr 48, and AFBQ -18-7-.& GPO * 

Form 12. 10 Nov 4.7, which may be used. 
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:r.mroRANDUM F<E B !IECHNICAL CONSULT.A.NT 

SUBJECT: Comments on D/F on Seourit,r ot .AFS.A. Communications 

(From: Chiet. Comm Div to O ot s. dtd 28 Mey' 52) 

16 June 1952 

1. Coordina;tion betnen the Analysis am EYaluation Division. 

the Technical Consultants Group ot the Office ot Operations. B.1ld the 

Oomnunications Division has increased to such an extent in recent 

months 'that i't is believed the functions ot the once-proposed Communications Security Review Board are now being adequately tul:t'illed. 

Co:mment Bo. 2 ot the subject D/F is considered to be quite appropriate. 

Para 5 ot that Commsnt is a restaunmnt ot the necessity- tor on-lim . 

equipment not l20W' available. '' '~1".Y • 

l - --· --rh..o ~ ti.~ 2. In answer to tbe query ot the Chief of Staff• the tollOllt :r:rg . .i.Lr:.1 W '.s 

intormation on present and plmmed activity in securing monitori:r:rg q<.U-'r·-J , 

of AFS.A. Conmmications ia submitted: U U ~ 

a. Continuing analysis of .AFSA communications is pertormd 

in the Tramimisaion Security" Bramh of the .Analysis and Evaluation Division. At present. :monitoring ot AFSA comm.unica:tions 

CO"fttrs all circuits in and out of the .ASA and NavSecSta (N-2) 

Communication Centers 'Which ha:ndle distribution ot the Comftproduct and aSBociated traffic ct the Servioes. The vclWDB 

analyzed approximates 650 :messages a worki:ag dq. As a result 

ot this monitoril:lg and analysis. and of direct coordination with 

the Comzmmioations Division. measures have been taken "llhioh have 

reduced 1ihe amount of informaiiion derivable from. AFSA co:mmw:d.-

cations by traffic analysis techniques. 

b. Plana have been made to have all traffic., including intercepttorwardi!Jg• to al'Jd trom the conaolidated JFSA Communications 

Centers at .Arlington Ball processed by :machim methods and further 

analyzed tor a period ot appro:x:Lmately 30 dqs before am. a.f'ter 

tile implenentation ot tbe OR.CUB cryptosystems in an effort to 

determim the effects ot the change. It should be noted that tba 

volume of traf'fio expected to be handled in an average worki:ag 

day will be approximately 3•250 :messages which will :require the 

use ot :machine processing 8J:Jd. an increased persoDl'l81 complement. 

It is expected that som ot the IBM taoili ties ot the Office of 

Operations and a sufficient number of personnel Will be available 

tor this taslc. 

3 • SOJDB other recent developments which will improve the seouri ty 

ot AFSA comrmmications follow: 

TOP-SECRET 
• • • REF ID:A57262 

9 JOP SECRffSUBJECT: 00JlllD9nts on D/F on Security' ot SSA OoDlllUlioations 

(From: Chief• Comm Div to C ot s,, dtd. 28 ~ 52) 

~ • a. Jrrangemnta haft been completed tor a simple cOV&r program. 

(See AFSA message date-tilm group 261648 Z April 52• AFSA No. 865839) 

to provide some degree of protection agaimt successful foreign 

a.nalysi.a ot those h:lgh preoedeme messages which,, trom time to time,, 

maat be originated b,y the ottioe ot Opermtions and addressed to all,, 

or marly all., intercept stations tollcrni.ZJg a sudden change in target 

stations• call signs., frequenoies,, etc. It is planned to haw 

ocoaaional dUJllDW' :messages introduced into communication cha.nmla tor 

the purpose of avoiding attracting attention to messages of a nonroutim nature. 

b. All ini ti.al material .f'or use with the OROUS cryptosystems is 

scheduled tor completion b,y 15 July and should be in distribution 

soon after that date. 

c. A standard manual of communications operating instructions will 

be available tor the first ti:ne to all intercept stations 'When distribution of AFB.AG 1262., referred to in paragraph 4b of Oo:mnen:t; No. 2 

and scheduled tor completion by l July• is completed. AFW 1262 

11ill be distributed with the OROUS oryptomaterial. 

~-£~~~./~ 

Joe SEBtttf 

-2-

c. c. CORRY 

Head, .AFSA-411