~~F ID:A65516 I • 

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Declassified and approved for release by NSA on 04-28-2014 pursuantto E.O. 1352a 
SPSIS-' 

SIGNAL 5EcuRITY Aa1£Nt::t 

WA8HINGTON II, D. C. 

I e e r e t .,. .lbalbarllJ' .. ... 

C..--•1119 amllllllaJ8 .... 

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SUBJECT: Analysis ot the Security of Communications 

TO: Commanding Officer 

Signal Security Agency Washington 25, D. C. 

1. Reference is made to a memorandum issued by the 

Deput7 Chier, MIS, dated J March 1945, subject: "Intelligence Concerning Security of Communications" (Tab A.). A 

part or the first paragraph or this memorandum reads as 

follows: 

111. The Director ot Intelligence, MIS is hereb7 

charged with primary reaponsibilit7 tor conducting research 

in connection with material obtained f'rom Ultra sources relating to (1) compromises or crr.ptographic systems employed by U. s. or Allied forces and (2J indications or ene1111 traffic 

analysis or U. s. or Allied communications." 

2. Atter three months of working under this directive, 

it ia believed that this part of it should be changed to 

vest primary responsibilit7 tor analyzing and &J'llthesizing this matel'i&l 1n a joint MIS-SSA committee since MIS personnel alone lack sufficient background and experience in communications, tl'atfic analysis, crJPtographic and crJPtanalytic techniques. Thus, studies and reports would be prepared at 

Signal Security Agenc7 with MIS assistance, but dissemination 

would still be a J1esponsibilit7 of MIS. Under the present 

arrangement, Signal Security Agency personnel have been working on these studies at MIS on an experimental basis. After 

SSA personnel have prepared the studies, the latter are then 

subject to delays in publishing and editing out ot important phases by MIS personnel due to a different point of view and 

the aforesaid lack of' experience. 

3. In order to insure proper coordination in these 

matters between Signal Security Agency and MIS, and within 

Signal Security Agency itself, it is recommended that a permanent Joint SSA-MIS Committee be set up to consist or the following members: 
REF 

SPSIS-3 (26 June 45) 

Director of CoDllll'Wl.ications Research, Chairman 

Asst. Director ot Communications Research, Deput7 Representatives f'l'om MIS 

Security Division Liaison Officer to MIS 

Representative from Protective Securit7 Branch 

from T/A and Control Branch 

Representative from Communications Securit7 Branch, 

Seoretar7 

4. Broadly stated the functions of th~s committee would 

be to deter.mine what studies are necessary, coordinate their 

preparation, and recommend their distribution. 'More details 

.are given in the subsequent paragraphs. 

5. Coordination will be necessary tor the pertinent functions, which functions are recommended to be assigned as 

follows: 

a. The assemblage of the complete inf'm-ma.tion or 

the Japanese T/A results and their explanation in terms or 

standard T/A tec;turl,ques. This should be the primr7 responsi- bility or the T/A section of the Intelligence Division, SSA. 

b. The assemblage of the complete inf'ormation of 

the Japanese crJ"Ptanal7tic results, the identification ot 

the Allied cryptographic s7stem or communications practice referred to b7 the Japanese, and the determination ot the 

correctness of the Japanese conclusions. This should be the 

primal'J' responsibilit7 of the Seclll'it7 Division, SSA, since 

this unit has access to the actual cr7ptograph1c s7stems and 

the communication practices emplo7ed as well as to collateral 

information (including an7 possible deception program which 

may be used). 

c. The determination of the correctness of the 

information reported bf the Japanese with respect to battle 

order, disposition, subordination, and operations of Allied 

troops. This should be the prima1'7 responsibili~J of XIS, 

since it has access to such information. I 

6. When the foregoing phases ot anal7sis and SJlltbesis 

have been completed, recommendations tor corrective action 

vould be made jointly, and the result, written up in usable 

form tor the theater commander, would be disseminated througtr established MIS channels. 

7. ~he process ot analysis and the de~ivat1on of corrective recommendations should be applied to communications 

not ~1 ot a W~ ii]E&R9 to t~ae epl~ed ~ 
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SPSIS-} (26 June 45) 

the Theaters, since the knowledge or such possible breaches 

of sec'Ul'ity, their analysis and possible corrective action 

ma1 be available onlJ in Washington. 

8. There is attached hereto a draft of a letter to the 

DeputT Ohiet, MIS, which bas the concUl'rence of MIS personnel concerned, implementing the recommendations made in the foregoing paragraphs, and which has attached thereto a revised 

directive to replace that of } March 1945. 

l Incl: WILLIAM P. PBIBDMAN 

Director of 

Communications Research 

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SPSIS-3 

S~JECT: Ana1ysis of the Secur1 ty of .. Communica t1ons . 

TO: Commanding Officer · Gigna.i Security Agency Washiqton 25, D. c. 

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l. Reference is made.to a memorandum issued by the 

Deputy Chief. MIS,.dated} March 1945, subject: "lntelligence Concerning Security or Comm.un1cat1onau (Tab A). A 

pa.rt of the first paragraph ot this memorandum reads as 

f'ollove: 

"1. The Director_..of Intelligence, MIS is hereby 

charged v1 th pr1.mar7--re·spone1b111 ty for conducting research 

in connection with material obtained trom Ultra sources relating to (1) compromises of cryptographic s1stems employed by U .. s. or Allied forces and (2J 1nd1cat1ons or enemy traffic 

analysis of U. s. or Allied commun1cat1ons. 11 , · 

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2. Atter three months ot working under tbis directive, 

---1 t is believed that this part of it should be changed to 

vest primal'}' responsibility for analyzing and synthesizing this material in a joint MIS-SSA committee s1nce MIS personnel ,.;;~~~~~~in;!f~~lhJutficient background and experience in communica- Iona, tra?tic analysis. cryptographic and crJPtanalyt1c techniqu~~ Thus, studies and reports would be prepared at ~Signal Security Agency with MIS assistance, but dissemination 

!

' would still be a reapone1b111 ty of MIS. Under the present · arrangement. Signal Security Agency personnel have been work-

/ · ing on these studies at MIS on an experimental basis. After /~~~ SSA personnel ba.ve prepared the studies, the latter are then \( ,.. ~~,,;~ '' \ subject to del.a7a in publishing and ed.1 ting out of important • , ,, 1 ·'' 1 ... phaees by MIS personnel due to a different point of view and ~)( ~ '1v5~· "'.' l , the aforesaid lack or. experience •1 ·'\.\/\;, .. r. \''> .. ·". 

11,} , ••. ;~· -·· 3. In order to insUl'e proper coordination 1n these ~· ~ matters between SigD.al Security Agency and HIS, and v1th1n 

Signal Security Agency 1tselt. it 1s recomm~nded that a permanent Joint SSA-XIS Committee be set up to consist ot the follov1ng members: 

~~med tty NsNCSS ' 

Oeput'y Associate Director fur Poticy and Re~~-l+t~~~tf'ft-;;+:f:ITf-nOn ~J30'(t0.,., ~ . -· ... -:·· 
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REF ID· .A65516 
DRAFT 

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~~ · 2' June 1945 -····-·· 

SVBJEC'l' 1 ~l.J81• . ot the 8ec11l'i t7 ot Communica tiona 

!Oz ~P'1t1 Qhiet, JUlitarr Intelligence Service 

Bo• 2B. Boo, !l'he Pentagon : 

WaabiJ'.'Ston 25, D. C. 

1.. Beterence ia •de to a memorandum issued b7 the 

· Deput1. Chief, Jlilitar7 Intelligence Service, dated :5 llaroh 

19,5, subject: "Intelligence Concerning Securit7 ot 

Co:mmunicationa" ('!ab A). A part ot the tirat paragraph ot 

th1a memorandum reads as tollovs: 

. "l. ~he-Director ot Intelligence, llIS is hereb7 

charged v1'th pi'illarJ reapons1b1lit7 tor conducting research 

in connection with.material obtained frOll Ultra soUl'ces 

relatil'lg to (1) oompromi••• ot c17Pto~aph1c 117stems empl07ed b7 U. s. or Allied·torces and \2) indications ot 

.en8111J' traffic ~l7s1s of U. s. or Allied comm:unicationa." 

2. After three months ot working under this directive, 

it is believed tbat this part of it should be changed to. · . . ~~5·'4Gat4~~1> vest primal'J' ~eaponsib1li~J tor~anai~·•·1 his :material ... 

a committee o~aed ot representative• ot the Signal Seourit7 ~ . 

Agenc7 a~IQ.11~1?' Intelligence Service. '!he committee 

would be ·reaponaibie .tor ·the preparation ot reports anal7z- ... ·. ~~~ At' .. ~~·~-·· ft • 

1ng toreisn a~cceaa wll& ,,.;;4!7?.aatfrl 1111 et 11r,~o ~ ?" . •• ,_, ' .... ,>. ... 

. -.... ~. " 

graplt:lct 8flbnm _., to eaadl10ti1 n1 ti•Uio aaa11=1ie ot All.ied 

communications. Diaaemination, as in the past, would be 

exclusivel7 through 11111tar7 Intelligence Service channels. 

'· It is suggested tba~ th~ tollov1ng 1n41v1~ua.1• should 

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4. 

~[''" ., 

REF1r:M\®es$}.\6J. ! .. 

ll\Uif lYlib~-~·~~ .. Director or Comnunic ~ns Research, .=.;.4.~ •• ...,...., 

Asst. p1rector or Comm.unica~io~a ·~esearch, Deput~ 

Representativesrrom MIS~ .... -" ....... ~·--.< ti-. · 

Secur~t1 Division Liaison Officer to 14IS· 

Representative fl'om Protective Securit~ Branch . . Representative from T/A and Control Branch 

RepJ'eaentat1ve from Communications Security Branch, ~ecretar7 · 

It ia believed that the committ~e. could coordinate· 

more eftectivel7 the research now b~1ng ~~rried on and would . . . . . . 

insure more tlmel7 d1ssemin.t1on ot ~eaults p~oduced. · 

. ~~- ~,J. •':;;'Pei·"'~ ~.d..ve . 5. ,,.·-1. ·~e•lae~_,di:r-ect~ =lace tt:aat or 3 March 1945 

~attached hereto.·(~~-......6- Ji) 

1 Incl 

Revised directive 

W •. PRESTON CORDEIUIAN 

Colonel, Signal Corps Commanding 
~r:Fil FA1 wv re ~ Gi) ~ r- . r •·• I, 1·:·..1 ~ . 

REF ID:A65516 

Director 

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of 

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Communicat1orijJ Jr~~ k. ~earc~ n~~,q [llDU. · , Asst. Director ot Oommun1ca.t1ons. Research., Deputy 

Represents ti ves from MIS a,-,·~· 

Security Division Li&ison Officer to MIS · Representative from Prote1Jtive Security ·Branch 

Representative i'romT/A and Control Branch 

Repreaentattve from Communications Security Branch, 

Secretary 

4. It is believed that the committee could ooo~dinate 

more efteatively the research now being carried on and would 

insur" ~~~~n ~r~e _¥,'.'!~~·., . · . 5. A t>evieed ~ee "b1'!:~h 1945 

~tac.bed hereto. ~If?) . , 

1 Incl 

Revised directive 

w. PRESTON \

1

00RDERMAN 

Colonel, Signal Corps 

.·Commanding.·· • I. 

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. . . . . . REF ID :.A65516 . 

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