' ' 

m:llfl'ES " llEETOO OB mE WORATOJ.tt SECURm <R JB/GSQ-.4. 

1•14 24 September 1946 

Dr'. A• Sinkov L Chairman 

Ir. t. c. Auun 

Ir. B. L. Cl.ark 

Ir• R. A. Diboa 

Jll". s. l:ullback 

Ir. •· •· Math••• 1r. 

JaSllln 

arr. Leo Rosen 

Mr• A. W. Sml.1. 

Ill-. c • Jl. 51.mw.tr s 

c:aptaiJl W • C. 1llaehcoe 

11r. C. C.. Wri&ht 

Captain Wallheoe openecl the metinc b,- •t.&tinl that it c&Jl8 about at. 

the request ot 11r. Wr1.lht. He reported that a paper entitled •1TaLua:t.ion 

et Seauritt' had been prep&l"ed in Secur1t7 Di•iaion and was about k> 'be •~t..d within Security DiTiaion and would later be circulatei tbrou&h .. out the Apne,-. Jl & .D Diritlion hu atated that th• over all probl• ot 

••mn'1ty 18 a bit bl"oe.d ror thea. Tho 1maediate probleae; tor 41aciiaa1on 

nr. 11et forth b7 Ir. Wrigbt ill the mmouncnent ot the meeting (TAB J.) 1 

<d. the .. .-ting •• turned onr to hill. 

•. Wript opened t.h• dieeusaicn b.r •tatiDa that tho •in quE stion 

•• "What 1a Hcurl.t.11" • reali•1Dc1 of oourse, that aecw.·it:r 1an•1 tho -.. tor •ch echelon. tabora tory 11ecur1 t,. 1a R • D Di'Yiaion t • ci 17 conIMt'll• Tbq are r•mponaible tor the de'nl.opment ot the e<tuipmnt cnlf• 

eaft&in faaheoe aucgeated that Mr. S-ll. tell the group ot h .. •xper1-

*'1C9S 1' th :Ni&l"d to laboratory usd field aecuritJ°• llr. 8•11 sa!.d be bad 

found that a.t'ter a 'ml" baa been eo1nc on tar about • 1Ul"i and th11 tronte 

&re JllOJ'e or lea• etabilisect, a first approximation 19 a one to ono ratio. 

When the ae.xt war occur• oiphOJ'Q' will ba'Ye advanced to where v.r,r 11e&rly 

laborator;y concUtion• wID be provided in the tield in eAth corps area. 

1or inatanca, tbs Sth AnQ" Group in Italy bad 1te on 1.ntercept radio and 

~aia crcmP• within an area ot 2S or 30 llil.ea from the tront. Varioiul 

8!.pal. comp.nlee nn ooabined, •orldnc !n 2 or 3 trailers, a.id t:1e equip.. 

Mitt iJl the trailers Rll J:IOd1tie4 to rut their "f'U1.0WI condition1. In 

auwtr to pu-aaraPi 2, Mr. Smll ••ti.Jllated that a cood unit :t"or r1rerenoe 

wonld actu.J.lJ 'be ) or 4 traUera or equipment am probably 40 •ert, with 

5 er 6 dittwent tata. Dr. JCullbaok then at&ted that it' a SIGJIP were 

supplied to each oowp&J17, the uount of t.rattic oarried wcntl4 eertainll" U. 

'\q) a lot at eMll1' personnel. It waa pointed out that if wa intercepted 

tTatf'ic Qt thia •ort w• would halve to determine WhA t :S:t. wa.a wortb-a ler&• 

Ol"tW or a 1nall ..... &eeur1t7 depends on the•• factors. Dr. Sinkov said 

that if' all. other tact.or• are eq\111.11 the •nem:r attacks 1.hat 117Btea which 

Declassified and approved for release by NSA on 11-07-2013 pursuant to E .0. 1352a 
I 

... , 

' It 

·-----~ . --·~------------------- JDP_lllf23 t-~• lea• people 1 &owner, 'Ule u.e117 woal4 not h9•1 ta te 11' :l t zieed eel 

Vaa Wor-.tion. Ill'. hall aph&•lsed that. n 11U.St either \an the pcaition. 

tbat the 9DeJO" ia liaited in peraonnol or al.a• t.ake th• position that he 

i..a .11.sw p«t"aonnel, and u .r.it tbat Seeurlt,. D1'fi•ion shoald tU• it 

tor pnted that•• ae9m1a he is mHwtted. It n were f'11bt.1ng 4eter.a1Tel1' 

N\11 being paehed baek, Haurit.y would cams •Bll.Olltall.ing downhill" and th1a 

h a danger that ,.. mut roreae•. 

Ir. Rosen 11&id that in the laboratory llOlution JrOll ba'fe two irroduoibl.f11--

.. I\ and length ot t1-. !be .or. people--tb.e taster the solution. •therefore, 

the trana~er to the field &JIO\UJ.tB to additio:a.s.l people and a h.atar r:mlution • 

.Ir. Small adde<! t.bat it would de~ an the et.ate or the nr. a-. Au1•till 

tart.her adctecf that •ahinea are 8U8ceptibl1 to bu:Mn arrora and tba t '..bi• 11WJt 

lho be corud.dered in aettiq t.h• hour• ot ••CUl'ity. Ir. lfricht repl.Led that ~. are set l1P to take aare or the l.attarJ bu.t, nevertheleH, ti.le r.1t10 

~ laboratoey to field •ecuri~ bas now been redueed to lees than onet 

Ir. Wript reported that on t'he ba.1ia of' the requeat R & D Dirt111on 

a4e ot Securl.ty D1T1a1on reprdiq use ot the TDS principle, R a D .DLYiaion 

"' now dnialne • •thod or determining how the aorubler ie to be aase, 1ta 

nlght, it.a secrurit.;r in l.eqth or ti:ae, etc. .l 10-unit •craEler 18 pre- ·-~ 'Ming Ul!led, and it 'baa been deoided that 100 \U11ta wcruld be th• lllLXi• ..,. that c::ould be utUiHd. The probl .. now 18 to ohooae the proper ralue 

'between 10 a.nd 100 eluente and still Mintain the 15 pcnmda. 

ll:r. tullbaok a&id he though\ the beat auid• tor develOJ 110nt on the 

.U/GSQ ... 4 would be some detini te indioa ti on i'roa th• people for whom it 1• 

'bdng 4nalopod what.her they would pret9r more security or less .. 1.gbt. Dr. 

linkov 1tate4 that the Ground Forces h&Y• been oomplain~g that they ban 

"84 no indication ot what pl"Oil'98a w• have made on the cryp1..ogr&phic pl.an 

(SmIRA). Be e-ageated tbat tbe;y bet provided rttb a •tateJDCnt or th€ 

ds.tticul.tit"e on the B/GSQ•4 and fldviaed that •• can ci"H tlla11 incre111ed 

H~t.7 it t.he:r rill ptndt the ••!Pt Um1tation to be ro.Jaed. llr. Small 

ad4ed that•• atUl would not be able to at.ate tbe eecurlt;r. capta1I Wuhcoe 

woqht up the tact tllat the question ot wei&ht 111 prtarned by AR 85<>-25. 

!he ailitarr c!:iaracteriatice are wh&t aomeone would like to ha:va, we atriTa 

toward the1t, ud one ot the three tollowing results is obtaill&d-• (1) 1f• can ... t 111.l.ttar,. i'9quireunta1 (2) IUitary req,W.rements an Mt onl7 

ta1.r well, bo.t the result la ma.ob better than anything presently lal.OWDJ 

er ( We oan be so tar troa llilit&r,- requireM11ts tha.t thoy will bl.ve 

.athing to c1c with it. Ir. Small replied. that all we can 4o is to g'.n the 

'QM1' a.n eatmte of th• ••curity it the tittl.4 conditions are •.uch &lld such,• 

and that under spec!Al oondition.a, the e•curit1 will. not be &8 sreat1 

Ir. Small alao awd it the wse ~ TDS could lHt tl.b.l.J111ted. Ir. 

lathen then n.18ed t.he queation or whether •• are eoing to do arqth Lng 

Qd. whether we are coina: to spend tor• mmey 1r lt will nner ba B.D\1' good. Dr. St.nkoT aaked it the T.OS and converter •C\Uipment combined would 'b-t secure. 

Ir. ll&thewa replied tbat tJte two diMll•ion1, trequenq alld time posi~ion, 

an llOl"• ol" le•• uarel.ated 1n the two best equipment.. 
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REF ID:A71823 

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X»r, Stun •id that what w• are ••Al'ebiq tor i• eo:ie ~t11m or 

Ydahtbig .. thod., ao •• au. &rriT• at aoae nma.bel" tor 4e1ipat~ t:•cu.ri"tr, 

•t the -.nt we haft no lhtt"e-t1r• •tbod ar d•tendninc it, as th(lre are 

all kinda of laotor• tendine to inYalidate &D7 r•sult. l:r. Wrtahtr atated 

that aost of' t.b.a ff.riabl•• had been eliainated~::" llr. Saall repll(.ed tbat ~· 18 th• beat that aan be done, Ir, S-.11 ubd U' there Lsn•t lce!I 

qt"Mmen\ that could be reaahed \Mtween the two dJ.Tisiou, to po:rm:tt reach• 

big •c:me sort or conoluaian. We aust oonaider •eoud.tJ apil'lst th1• seeidngl.7 be•t eneiq, and we 1r1111t aetnm.l that h8 ha• equipment as 1ood as oa:·s. It 

-U..t ie 110, field aeourit.T ean 1111Ver be veatel" than laboratory aa.sur1v. 

Ca.J>tain Washcoa •tated that n ba:Ye nothing now that ie suitable tor 

the U/GSQ .. ~, and &eked it' the SlGJ1l' iB lood •noueh in the uant1 •. The 

Grounr1 'Forces do want equip!lf3nt, and 1n the n11nt or enot..'1.t'tr war, ... mu.at 

han •mM 4mce to use. Captain Waahcoe tmother stated t.bat he aml'lidera 

ti. Sl<\Jllt 11. i'ailure becauae 1t doe• not lfOrk, n.ther than 'becauae it does 

not p:ro'9'1.d.e •naagh ••cur1ty. Ir • .iwstin rai1e4 tb• quurt.ion of wb•tb.er we 

•houl.4 make the SIGJlP betttr or 4eaign a new •chine. 

Capt.ah. Washcoo eo11timif!'li t!lat •• haY'I to thhak-"\Tould this device 

ciT• th.em eoathing or would the7 be better ort without it?" Th• 1.ntormat1on 

ka.DSled. lQ" the device, 1:ir1.11ESm.1tted -ander proper controls And pro:ri1r rules, 

wonld be tactical information not haT!ns long ranae 'ftl.ue. It rd.E.ht, bO'h'Yer, 

.rttwr Wormation which would later be tran•mitte4 in a higher 1ecur1ty eystea11 

thus c!Tin& a break into th• higher •7•tM1. Inroration tranemiti.ed by low 

•cbelon:3 •mild be or a nature that would not require a long per1cx1 ot aecoritf. 

II". Austin broulht up the quaation or conte:renc•a b•hHn re,,mnt.s, ec;nr,pa.'fti~s, and platoons iJ1 battle. Capt.in lfaahcoe atat!Jd that a net WOllld 

be set up enabling thie to b9 done. lh". Wright ukad ro1· a detin ltion ot 

•radio net.• Capt.a.in lfashcoe replied that a Mt consists~ •en·aJ. atatioua, 

ctb.t "beina the central etation. •.1.•, i.he o.ntra.1 •\at1oa, can talc with "ll" 

-.84 •c•, and wa• 4Jld. •c• can talk with eacr. otb.6r. !he point was bra"U&ht up 

tb.at it the latter is true, it actuaU1 is a. conference. Dr. Sinmv repllod that if we• and •c• couldn't t.aJ.k to each other, operat10Jl would be very 

lla1.ted • 

.Ir. 1tr1ibt brought 'PP an entire~ d!t~erent problsn, involv!ng the 

taetora in a. and b. ot paragraph 3. !htt inherent eeourit;r o! the AN/TRA-16 

i• in U. teclmlque o:l' tramnahaion, prorldec.1. that the enem;r ie x:ot in the 

line of' th• t.ranendlllaion beam. Ir. Small A.id that the Qermne l'ad estimated 

two ,-ears eeOl.tri ty on beam teletype, but wet were abJ.9 to collect the trartic 

and read !t to great adTantase. It was atated +.hat the probltol!l jn th6 

J.J/TRA-16 is the recording of the aa ter:llll. '!'he on]Jr way the tn ftie oan be 

interpreted 1• b;r lietenin& to the plain text. Mf1' aecrurity naJuatlon will 

ba'Vfl to be mda When the problem or record in& Ule tratt'ic 115 •ol, red. llr. 

•thews nated that th•r• -· no poil'lt 1Ji ducus•ing )a. and )b. on the be.811 

ot the roreeoing di11ousaian. Ir. Sall added that line or sight transmis11101'1 

'bea1IN! Oil the horizon. would bo out or the quest.ion unles• lt was :t.nrra-rec!. 
tr.t. Sinkov 4rew the toll.091.nc aonoluaiona1 a• J) Div1e1on ha• w1tb1a 

'\be laboratory a •thod of l!&kin~ a 1tatemtnt re~ the ratio i.P.v:U."ffd 

h. coneiderinc the •ecarit71 Securlt,. I>1v1eion llUJSt Jaan •catt."i.ing to pro. 

Tide th• Ground Forces 1D the way ~ equipaont 1n the D8&r h:tur•J we will 

4o the beat n can to ... t ail1.tar; dlaracteristiee and p.n the beat ••curitJ 

ft oan. Sr, Cl.ark added t.bat no 1:1atter what decim:l.on •• •·:!.e now, w• would 

•tUl be raced Tith tile Ul!9 problen with the Air i'orces. The Air 1Dt"C88 

wry d•tinit•l.Jr bays a tranmdeaion problem. 

Ca~ta.in 11'aahcoa etat.d that 1ntft&J."3.ted e~iacn.t directly tie• together 

tb• eecurity &neJ transllieeion elem,,nts, The !H/TRA-16 1a is:. itself an intepted piece ot equip.-r1e11t. .&n opinion b.sd baan exprees~d b) Mr. Friedman tba.t 

an 1nt•gratad equiptl€'nt. could ba described a.a q equipm~nt. with all S.ta put.a 

tu;Dctionin& aa a mdt 1n such a •7 that the ccmpl.ete equipment would cease 

optll'&ting if the C1l7Ptographk feature ware reaand. ni.e Air 1orc:ea disagree 

•it.lo\ thi• interpretation beca.uee th97 do not want to CC111Bider radio equipment 

as oryptograpbic equipnent. lfewrthele111. thi11 is the A.SJ. def'initicn u it 

new atande,, and Starr S.s detending it. Mr. Mat.hows atated the.t the .All/T.RA-16 

would not fws.c'tion without the ke7 pnerator. but that it oould be acdltied .. u to •b possible a k$1 sei.Uns whiah wO\lld reduce the at.tect oi the ~chania'll to aero. C&pto.in Waehcoe add.cl that a plajn wai'er could ~o be thrown in and that it would produce tbe aae err.ct. 

l.r. lfrijht closed the :moeting 'b.r st.sting that the anlJ •olution is to 

d.o the best we OB.!l on tho SIGJIP. nr. Sinkov aid the whole :problem or .f'ald 

'ftf'SUS laboratory •eauI'ity would be :set aside, and Captain Waehcoe ai!ded that 

Jt & J) D!:Yi11i(m could iO through tJ1th t.b.eir ••lii-.tee ud indicate tte laborato17 

.. cur1ty afforded. 

:a. l • 1>tl300 

Technical Statt 

Eecur1t7 DiTision 

4 

( 

zc ¢ J ¥"'.'" ~=':c: .. '_ '·~' "' 
CQll'ERENCJS 0900 Tueeday, 24 S•pt8llbar 1946, :IOn!! 1010-.i\ 

Jlitqaasted 0,- Mr. Wright or Jt ~ I> l>1Yid.tm 

l. Obj$C:t 1• to obtain a ar1t.erion or eu.tt'ioient aec-(,irit," r<•r low 

and -4.iua grade oililOl\1' and •U'ax .,.teas. 

' *• General - Set up tntatiTe]oT a policy wftic i:mtlf dEt1nite 

to pYe u• a. t1r1t app!'oximation ror correlatinc 'laboratory eecuri~ rltll 

•tuld ••OW-1~. It 1• :realised that in the tinal anal;r•1"• •J•oU'io 

1q..u1puntls "ill han to be coneider-4 1J14iv1dua117. 

'· lt praaent., •• bfldl,v need a definite 'Mini!llml "laborat017 

lftCUritT' requiraent tor U/G&~--4. 

2. •• TOUld like tG standarditse the unit uaed in stilting •1aborat017 

Ncur:lt7.• -re feel that this Wlit 81.gbt well be defined in teDB )f a 

acn.al field voup which would be •••igned to •ol~ the traN'ic ~om 

properlr recorded intercept. 1.e. 2 men and 11000 l'bs. or •quipit'•nt ld&ht be a nuon11.ble =lt. 

l. Cc:malderation• •hiiJh 1E&t UCH!Uil7 be coneide~ed to de t.ei"tnine 

the corrolation 'between •ti.ell\ seC'IJr1t1" and "l.aborat017 aecur1t7"" 

a. hppase the equipm1Jnt •e lbd.ted exolueiTal,y to Tel";T high 

tr.queuey "4!os by 1:\s 4-eign and therei"cre trr..naa1saion would al.1'8.19 be 

line or •ia'h t except in Te4f7 untmU1l in• tances. 

-· Certain 'tn>e• of modulation, notablj" pulse aodulat1onl lllght ar-tl.7 increase the problems or reeord.ing and playing ba.c•l( interrcpt. Thi• 

tollefJ about becaue• or the Jt.igh mpe9d recording; Md1UJ!I neceesar.1 ud the 

ll*ed tor •ecurat"}J" tilled recording• to ate plA;rback poseible.