8PSI8-3 

SUBJBCf 1 Anal7•1• ot the 8ecvit7 ot Commun1cat1ona 

!Os 0()!11111111d1ng Otf1eer 

Signal 8ecu.r1t7 Age11C7 Vaah1ngton 25, I>. C. 

1. leterence 1• •de \o a memorandum 1aaued bJ the 

DeputJ Ch1et, ms, dated' llaroh 1945.a aub.jeo\s •Intelligence CODceftl1Dg lecu.r1tJ of Communicat1ona• (!ab A). A 

part ot the t1rat paragraph ot th1• aemorandua reads aa 

tollovas 

•1. !he Dlrectoi- ot Inte111genoe, JIIS 1• hei-ebJ 

charged vith Pl'illar'J reapona1b111tJ tor omiduot1Dg reaearch 

1D oonn.ection. v1th •ter1a1 obtained troa Ultra aovoea relat1Dg to (1) COJIQ)l'OJ1188B Of Cl'Rtogr&ph1o BJ'Bteu eaplo7e4 b7 11. a. or .l111ed torcea and. (2J 1nd1cat1ons ot enmq- tl'aft1c 

anal7a1a ot v. 8. or Allied commun1.oat1ons.• 

2. Arter Uiree aontha ot vork1ng under thie 41rect1ve, 1t 1• believed. tl'Ja~ tbi• part ot 1t aboul4 be obanaed to 

veat prillal'J' reapon•1b111t7 to~ anal7zing and •JDthea1a1ng th1• •ter1al 1a a joint 1118-SU. ooaittee a111Ce 1118 personnel alone lack autt1o1ent·background and experience in co-.unicat1ona, tratt1c anal7a1a, Ol'JPtograpb1o an4 ~l'JPtallal.Jtio 

tecbni,uea. !hue, atud1ea and reports vould be prepared at 

81gnal Bec11rit7 Agenc7 v1tb 118 aaa1atance, but d1eaem1Dat1on 

would at111 be a reapone1b111t7 of 1118. Under the Pl'••ent 

arra.ngemeat, 81pal 8ecur1t7 .l.genc7 personnel have been vork• 

1ng on these atudiea at 1118 on an experillental b&a1a. Atter 

88& per•onnel bave prepared the etucUee, the latter ai-e then 

aubjeot to dela7a in publlab1ng and ·editing out ot important phases b7 llI8 personnel 4ue to a different po1nt ot v1ev and 

the atoiteaaid lack ot experience. 

3. In order to 1Daure proper coord1nat1on 1n tb••• 

•ttera between 81pa1 8eourit7 Agenc1 and JIII, and within 

81gn&l Beov1tJ .lgenc7 1teelt, -S.t 1• recommended that a permanent Joint SSl-llIS COlllllittee be set up to con•1•t ot the to11ov1ng aeaberai 

Declassified and approved for release by NSA on 04-25-2014 pursuantto E.O. 1352a 
-- .... REF 

arsIS-' (26 lune 'S) 

D1reotor ot Co1B\1111oat10D• Jle•~ch, Oba1Pll*n 

Aeat. Director ot COlllNnloat1ona Reaearcb, J>epUt7 Bepreaen.t&,1ve• tl'oa JIIS 

leour1t7 D1v1a1on L1a1aon Ott1cer to ~ 

B•»r••entat1ve 'trom Proteot1ve 8ecurit7 Bra.nob 

&epreaentatlve trom 'I/A and Oontrol Branch 

R•preaentat1ve troa ComaUD1cat1cme 8ecur1t7 Iran.oh. 

8ecretar7 · 

"'· Bltoad17 ttated th• tunot1ona ot th1a ooamittee woul4 

be to deterat.ne vb&t •tucU.•• .-.re necean17, ooo»d111ate their 

prepara,1on, and reomaen4 tbeil' 41•b1but1on. Kore 4eta11a 

at-e g1v~a Ul ~e aub•eque~t parapapba. , 

5. Coordination vill be nec••a&rf for the peJ'tinent tunct1one, vhieb tunctione are Hcomended to be •••1aned a• 

tollov•a I ' 

a. !he aeeellblage ot the oom.plete intOS'Mt1on ot 

the Japanese T/A l'eeUlt• and their explaaat1on 1n tenus ot 

etao.dar4 'l/A teo~uee. Thie eboul.4 be the prtarJ reapona1- b111~7 ot ~he !/A ••etton ot tbe,Intell1gen~• D1v1e1on, aaA. 

' 

_ b, The aeaeablage or the complete 1ntormat1on or 

the Ja:p&11eae c17ptanal7t10 reaulta, the 1dent1t1oat1on ot 

the Allied crJPtogr&pb1o •J•tem OP 00llll\ID1oat1on• praot1ce ~et~re4 to b7 the Japanese. and the deterain&t1on or the 

Gonecta••• ot 1'he Japaneff oonolua1on•. t-h!• ahould be the 

pri..ry reapona1b1l1t7 or the 8•our1t1 l>iY1a1on, SM, ainoe 

tb1• \llUt baa aoceas' to the aotual Cl'J'Ptogr&pb1c e7at .. an4 

the coauntcation prac~1c~e emplo7ed a• ~ell aa to eollateral 1Ato~t1on (inoludShg &DJ poeaibl• decept1on ~graa Vb1oh 

•7 be_ uaed) • ~ . , ~- . . 

- o. The 4eieJ'll1na\1on ot the oorrectneae ot the 

tatormatton reported b7 th• ·Japaaeae v1th reapect' to b&ttl• 

order, 41apoa1t1on, aubord1Dat1on 1 and operations ot All1•4 

trooP•• l'hi• •bcNld be the prim&Q' reepona1bU1t7 ot .Jal, since 1t baa aoee•• to euch 1Dtora.t1on. 

6. Vheii the toregoing pbaaea ~ anal7•1• and apthe11a baYe been eoapleted,, reco-endat1ona tOl' e0fttect1ve aot1on 

vo\lld be •de Jein\17, and the result,, vz-1tten up 1n uaable 

:torm tor the theater com·nder, would be d1••eatnate4 tbroq}). eatab11abed 11%8 channels. ' , ,_ , 

7.. Th• proc••• ot aM17•1• and the derivation ot ooPrective recommen4&t1o.n• ah0\114 be app11e4 to oOllllUD1o&t1one 

aot OA17 ot a "ar l>eputaent eobaloa but to thoae 91aPlo7ed 1n 

D r1 ___ 1rn ~ :_. 
SIS.IS·' (26 IUD.9 45) 

the Theater•• •1Doe the Jcnovledge of a'UCh po1atble bzaeaohea 

ot ••C'IU'1t7. 1il1•1r anal7a1a and poaa1ble oorreot1ve action 

•1 be available cml.7 1D WaahiDgton. 

8. There 1a attached hent.o a dMtt ot a letter to the_ »eput~ Cb1et. ma. Vh1ch ha.a the ooncurnnoe ~MD personnel oonoel'lle4, 111pleant1ng the reocm mdat1on• •de 1n tbe roregoiq parasrapha. and vbich baa attached thereto a revtaed 41Nc~ive to replace that of 3 lla:rch 1~5. , -

1 Jncl• VlLt.lA.JI P • •fimlWI Direct~ of 

Comaunioat.iona Beaeai-oh