DOCID: 3678776

I .

.

=:ieclassified and approved for elease by NSA on 04-07-201 O pursuant to E .0. 12958, as ~mended. ST56834

AN AGREEMENT BETWEEN GC & CS AND NEGAT

ON JAPANESE CRYPTANALYTIC TASKS

23 OCTOBER 1944

DOCI1': 3.f,78716 • ... ' .. ; ....__ lOt SlCltl ~,s,,~

7Jls AH .AOHEBlii&IP.r ~·;.mm 0 C I: C S

.A:O> llHGA'l' 011 JAPAtnmB CkY.PT/,11/iLftIC TJ..SICS

"" 2:.i Oo tober 1944

In Ol'cler to 1d1.d1aiae tl:10 use or z••»ici aOJWIWlioat1on ta.0111 ti••

ancl to ,pronote JW0,1Mlr 0001•ain1&tion bJ t.t1e m0at e1'.a."1o1ent •~lo;yamt ot

..,eraonnel,, ..,art1cularl)" 1n t!J.e aa:LutJ.on ana. OJL.iJl01 t11:t1on 01· tlloae J11..,aneae

0Z7,ptoGZ"¥'10 11;:.--ato1-1a wh1oh require ·tlie ooub1nod e.t".t"o1·t or .1.-e111tiv•l1'

large nwnb111•a 01' ~e1•aoua, tbo 1'ollow111g points 111•e •Gl"•etci UJilOD b7 0,,..-20.g.

aa.d. G C & C S.

0.wH.EhJ,L 1'Q1.Ri\kHIP.r •

THAPPIC ---

lo 0»-1l<>-0 - PHUPAC - Plitmli' wlll be tbe &lq>lo1 t:tng and

d1at:r1but1ng aentrea or our:a.•ont operational Oomaua1oat1uraa

Intelllgenceo

8a O~·H0-0 t1ill ooorcl1n11te tbe uni te<i e1'1'01•t nga1n~t

Ja,P&noae Co1uun1aat1ona Inte~l1Lence tilW. al.locate task!.

with lia.Pa, 0£ oourue, 1'ree to nake BU;a;e11tion1. 1'8'4.~•A•

S" OO!Wla1.uta at llll.J,,, t11i19.,o

a. O c le C s will take on &IQ' tasks lll.locat&u by 0,11-20-0

Mnci 8\1.Cll tasks Will be {;iven i'ull _.arlo:rit70

4. Acw1t1mwlly,, in ao rar aa 1..u.o bl.aka alluo11.teci urlder

(3) po1~t. O C le C S will Clo aucl"1 m>:r•k as J.am.ralt1 may

ruQueut and. 61DJ work neoeaaa17 1•or tra1111na .A'Ur..,oaea and . reaearcb.

•

!o be .\J&&aed to BeSaC o for .rorwai•ci11ac to Bo Pa by 'bag,. in

case or Jlf 25 and. any non-ow·rerit o:r non-assigned Ja,t>aa.eae

BJatems. and bJ" cable or \"//'l' ln case or other a~ratema tbat

are belDG worked CUJ•J'«.111tly by BaPo 1n accol'danoe •1th

aaa1uruaenta t'ram llEGNl' 0

UMSOLVRD SYSTUWJ --hcPo• wbon reque11tect b:f lf.d.tAT, 1 8 to woi•k on &nJ a;yatom

tor •ld.o~ tra;1·1c 111 available ot haPo lfo truf'1'1c 18

to

be au9plied on a cu.rro11t baa1a .ror .P&•ain~ bi cable except

•hen at tl1e re~ueat oi' lmGJL!l' hell' 18 suli6ht ·o.ri a ·~•ui1.'io

lOP SECREF

..:.

. DOCI;D: 3678716 • ... . ..

page r 8

SDl' .. E liDDI'n VB li!GOVICU -

JJoP9 to wm•k on bulk ada1t1ve recove17 onlJ' •• re"119ated. bJ

1111JA1'. .kequoat• m.• to be 11recl1outed. on tlw atatu11 of •J•ter.m

available t"or work. ?IBOA'l will normall7 keei> tl1• mo1•e. :reoent . I

and. o,Perat1onal tJP11••

EA.PLOI'IJ\~IOH ""'

In general, Bolo wlll l'Gkd aucb oUJ'l•ent li'LOVll§tDOY4l lnte.roe,pta

aa tae7 can td.tb 1ihe mato1•1ala they bave availableo lllmt.'l

will s1ve auoh •a.o1e !'11Ung• aaa1atw1ae on izqpOl'trmt ourz•aat

•aaapa aa 11; Olm when i•equeated b7 BoPo

Il'l'EkCIUUOB OP hJ.X:OV-.s::EiIHS -

HBO/\!' will eend. ack11t1ves to BaPo bJ air mU exce.1i>t •hale

.tlllei•a• and thoae t~t a~J to current 111atem.e •••1i,ll9d

to D.P •• wldah or OOU.Z'80 vlll aEO b7 d&B,PILtohe Bxoe11t ••

1nd1oatoc.l abo\•• all curi•cmt reoovei-1c.a Will be e.xabanged

b)' aeu.aatoh wad DOA•O\ll'NDt reoove1•1oa bJ' baso

fJ.8'1 Cifll.Wt JULl0.111 -

..

lo Bo I• wlll ooopora te OJ:l YIOX'killg RDJ' baok o1,Pbe1" ,118r1 oda

u..,on •»001.t1o i-equ.eata .t"rom !mGAT - but d.oe11 not want th1a

~ae aa 1 ta on17 aaalpmnt. aud t1ould pretor to be aaked

to ••aoh ,pe.r1acta with a a,,eo11'"1o t7,Pe 01• uaetul. intonation

aa 11n objeotiva.

2. IWGJ.': v1ll f'urn1ab B.p. witb all available aid.a to

.tao.1l1tate D1_!oll 'l'IOJ"ko u.R. 'Dill tui'llillh lmOA!' •1th •ll

jJU.bl1ont1ona and reraul. ta an any and all Cl'J»tanal~io

raaultao

lo li • .P. "111 ba speo1.ficall7 i•equeated to work J1f m; L•ti8.

2o Until Kati c1iJl'ie1•11 become wo1•kable .UoPo 11111 ooo,perate

with lf.UOl~f an the •W.ution or tho system.

3o Ir arlCl when the Jlan o1,tJb&Jta become woriul.ble• one or

mo1•e a1,ilher ..,e1'1od.a wlll \,e aaaie;ndd 'to Ba.Po

"• s..-aial •tud.1ea or ,a.abksea of atud1ea .-7 be requested or lio p 0 •• needed 0

18P SECRD

DOC ID: 3618776 • TOP 'SECRET

5o Oubjeot to the chan.,roa 1nd.1aetod in thia clocum.ent. existing

a1'rangenenta betY.'8811 100/LT and Bo.Po with 1•ea,.>ect to allooat1mia

anc1 1:ira:ri·1u exoha.nge, will l:e oontinuec.l .until al ttt1'9d c1ro\Ullow

stance• make edJ~atr.ienta necea&ar}'o

60 l'Uture aau1UX1Jll0nta b7 Nl!:OAT will be 1n ~ha general u~1r1t

ot tllia agroomento

'l'ltflNSLA'l'IO.tJ AUD COD~ .n.KCOWHY -

l. UHUA'l' will, tram tbia date on,. au.-J:.>J.y lioPo wl tb. orie OO!lJ'

ot oaah IBU aummaey code l'oooveey work-book together w1 th an

index. to that traff'ico llowevel",, because ot 11.mited tao1lit1ea.

auch booka can cml.1 be .t'urn1ahed. on the lfBOA!' aWU1Mry _p1'1nto

2o lioPo will exobanse oop1oa ot all tranalat1ona,, and the

reaulta or all s~eo1al atudiea produoed in the Ja~aneao

8J'Btema, w1th HBOJ\To

.PU1'L'.&Cl:.~ION l~XO!U\!10~ •

RllJ.AT and. BoPa will aontin\&e to e.xohange all teohn1cal

1n.fo.l'mllt1on inclwilzl(S re..,a:rta ana •JJ'lusial. atudiea on all

branohe's of the wo:rko

'l'he Comzn1ollt1ona .Agz'aer.ient, involving 1:1.ll un1ta 0011cernecl

witl1 the Ja..,aiiose lll"Oble:a,. 1a ueta1lttd 1n the attaohed

onolosurea A arld Bo

Bnolosura A • fo_p Seol'et 149moranc:ium tui• tlle l>;t.l~t:totor ot

Havel oomm1oat1una, <lated 6 October l.944., and. a1sned

b1 Ao Ho U1llgarth, Oa~t~ Kolo

Bnelo8Ul'e .B - J>ratt ot ULmA Signal i'roa 0 1n c, BoPo to

Admiralt)" datod 6 October 1V'4o

•

i:r 6c to6'9r ni4i' La/ JaKoRa

• ~•~ ·S£CR£1

DOCID: 3618716 •

'°' s£e1ltT BNOLOSUkK J\

(oow>

dt&ORJllJD\Bl POI\ Dil\IXlTOb Of NbVAL COi.U.Urn:caTivllSI

6 ootober 194"

In oont1l"Ji11lt1on ot our o~ve2·aatiu11 I l.l.laY• aet o.own the .following ,6101nta as lltSl•eed.:

1 '!he ,.>i•o,y<>aetd ouam - uoloLJbo c11•oui1' you so ld.n<llJ u1•te1•tJd w1ll

0. . t l t. equ1,pz.lttllt ceilculaited to .blr.oo~e uo.ooo oroup• l)6r

:m,.,ri:: .:., fJ ):(his is ox,ptJotllci t,o be J•eac:iy J."ur- tl«J8J)Vtc.b in .November, tiJ .~~ to tatke ue:i.1"eu.'~ 1n u.s.b. u1· . \J&O equ1~r.1Q,,t 1'01· Colombo llnd ahiii aa ra~1ulJ as ~oaatbleo ~ On this Ouas.i - (;oloi.lbo u11•cui t Fl.USP will i•eoe1 ve to LlL8 C&!J&.Ci ty ot tlw cii•cul.t all J~.\'WlQU& a.eo1"l·~tion I.ntt:ll1~toe. 1•eco~e1•loa~ orJ.->to-oliat uud t1"k£1'1o &J1ul~aA.a (lJISC and. ~) .frolll Op-20-G and .l'hUf'IC, 1.e. tlW f~ll out,to1'1.1.t f:a:cm thodfl atkt1ona6

3 bJ" tb.e ~we o1J•uu1t li'l\.Ui>AC will 1-ec:u.i.ve1 ·all Ja.,t:1&11e&ae 4eceypt1on 1~tell1e;e .. use. recove2"i&a. 017,i)to-olW.t ••ntl t1•1tt1"ic El • .kl) uls .r1•om a.c. arid c .s. ilrid. PHtru.F 1n tue aauo manne1• • .vlua ~lu.atevei· load. or unique r11.w uute1•1atl i'1•om l'ltl.JKP tho ciroult c&n t.clditio~llJ carry ..

40

it the tra1"~1o 011 tlJ.1a u1:rcu1t tJ•om Guam to ColoMbo exoeoda 80.UOO til'OUj>8 1 tile bal1u1ce will be lil'IU18.td.tted. Via i&eluoui."ne~,

I . 10 " It 1a e11tim.teu that tlle nun-1-aw nr1te1•ifll trc.t£1c 011 tll1B circuit · i trom. Colombo to Gua11 ia unl:i.kel) to oxoeou 60,000 gl'Oll.t.JS in the near future• ,tbua allor1itit~ fl tual'Uin ot 001000 gl1UU.,h)& to1•. t•&W aaater11:l"

'- ~tra ~aw mate1•1fll will be IK.,.ut 1"1•ou l"l .. Ul:.11 t:o :FRUP/,O tlu·o~h »lbcn.u·ne.

6. Since tl.ae ouaa - Colombo c11•cuit w1~1 not nu1'1DQll7· laoconDOdate raw mate.r1kl. weatbuuua, l'"'' tlkte1·1al i•ecei'<;eU b~ O,b>·i:tl-.D r.1'UU. MU1.PIC wi:i.l be .C'OJ:llkl"<ieu ·to ChC .. Q.uu (:es. via H.s.c. Jfew Yurko

In 01•Cle1• to 11.voicL uoubl~ enc1,1Jlw1•llJ.Unt c.1· i-aw ra.ter.i•1&1 at Ph.U~, \\\ it is ogr.•eed t.ua~ 1•11.w 1:114turiu.l s11nt 1'1•uR 1"1.UBP \11& PJr:/,hJ. to o..,-~o-a ab.all be l1kewlae i'o1'Wa1•ciea. on b)' 0.1:1-~0-G to a .. c. L-nci CoS. via :&cS.C .. New Yorko·

In oont1IUUlUce of. p1•oatmt arra.iJ.Gt>r'lDnta :•

(a) Un1"!ue raw t'lkt&rial reculved at 0.A'·20·U trm.1 U•llo bl).d Canadian statiuuu w1:...1 be 1'u.1.'Yffll"Uec.i. tu OoC• und c.s., an<i unl'tue raw lDl•:..erlttl i.i:1te1•oe~tticl by U.K. atat1ona will be ro.1'W&1'ti.ea. to 0.Ai>-~0..Q 1n both cases via ,b.S oC., llow Yurko.

7 o In view or tho neea i·w.· 1''h\ll:!P to have, as earl)' ·Ms .,osaihlo, al.l tho ou t..,u t uu tliued 1u .t>IW•gralJh 2, :,i uu ai•a 11u1 ta. lliiit; a manu&l cll•cuJ. t 1t.t Qu.amo It 1a estimated that this shoulct be 0,1)81•at1ve in 11.buut 3 we~k• 1t.nca.· t.IUl t 1 t Vi.A.l car1·~ U,t1WLl1C1B of lOo 000 uroupa pez- day eaoh .'wa~ c Penu1ng tne 011eniiiu ot tlw .telety,.w ol1•cu1t, 'tl10 ra11uttl oil'Cuit will 01u·1•y tho . more ui•gent mUSA 1!l8.1:.Le1• botb ""'~a, as muw1 01• the b1.J.ance aa poa111Lle be1ne aent v111. i.aell>Ott.t•na.

Bo The JiellJOUl"Re - c:olombo link will now c11.r1•y ~P..ooo r;rou"'a ,1>81' day each way• but tJd. a shoulei inor•ea oe to bO, 000 abo1·tl7 o

9o !be main ,PUr,i><>Be of the new oi.rcu1 t 1s to ,.>lttue FhlIJ:'l\0 an.a. 1-'ILIJ~ in tW:I ct1n1~1·e ot the hhi.r.;A o1rcu.lt 111stew:i. 01· ut Ule extrom1titta 0

TOP SEGRiI I a/ I• • II • lJILl,(J,ll,Tll. Cll,1Jt&1n1 l\ •. 1-J.,

DOC ID.: 3678776

•

- -· ...

•

Page ti 5

IJ.'9P 8H9lc1'P hlff:> P.OIESOHlaL

TOP SECREI ill!OLOSU1~ B

(co117)

UL'l'hA. ·6 October 1~44

. Pare" 1 0 Acb.11ral heo.1111U1 lwa 1nd.icM. tea. tu i:ie hi a l"&•o1•akniaa tiun in tho Jaclr!o" J.J.oa1, lll'U... lwa ,,.mt 1"0111J1ard ,i>:t'CJ~oaul:11,, wi tl'1 wn1ch I agruu. ror linking u;p Ande1•aor1 1n tbis are11 net 11orlc.

Para a ll o 1te•·Ul"!?Ul1aat1on in .ffhe Pl:.CJI'IC /Url-;/l;.:.

(a) It hhs. bttoa ueciaetl tliat UoSo e.xplo1tat1ona on all CYt.!llara w1ll be oorioe11t1•1ii.ted iri .Pltm,;,c. Only .m1r101· uyatena and. tra.1'.fia anal~ois w1ll cu.at1rna.e· to btt wo1'i:ea at JlelLour.m>o . (b) \11th this object in ,,iew. arara11t:OJ•1f.U1ts m•e being nw.de 1trJMe<.i1atel7 to ..,.caa to Jt'hUPia.C a.nu Op-20-G lJY 1•adio telot7,iJIJ all w1ique raw .IDELtoriel .1nterce..,tel1 bJ Uc·S.!1(1 aud. ilolLo.ffo intei•ce..,;t atat1oz1a in Auatral1a.,

{ o) An 1nte1•ce11t at11tio11 1a being fJstai1lis.U.eu 1n OUJ.JI whicll will J:J6.BB l·at~. t1ateri11l to 1'"llUPJl.C unu Op-20-0 111 1•ad1o teletype.,

(ct) An 1ntoi•cso.t,t· at&&.t.iun .baa l;eo1.1 eatKbl13itaO.. nt AD.t~l~ to p11.aa r11w m&terl&..l 1.n " s!ml11r tlrJ.'10 Otn.o:r 1nte1•ce.a)t st1.ationa ·w1~1 'be est&.1Jl1a.ne.id . aa .r•equ1.1.-edo

( e) Iritell1gcmoe j.lorta111ini.( to 1,ust1•kliit a.nu 1adJ&iotr.11. t ''" toi·s 1111.d. tllll t conoer111.nt~ r.taJ01· atra.teglc JolO\.·ea will bo posoed. to l4olbouJ.•.110., ·/all intell1t)0?1ce uerlved trors 1ta. avm ~·ocouoiut; ,.,ill be .,n,aaec:& b}r •.l~l\lott1'ne on .bltUSA .,

( :f) ULThA vaar.f,ber 1n.to1•11ftl.1on Will bo pesueu. ai1•ect rtto:m. !lk'VJ' \'iet.tl.r.er Central .Pearl l:lkl"'buuz• tu Ha..vy ~/eatber Oeut.ral )~HUS.

Parao 111. In· OJ.'ti.e1· to ausiut !~JL~.lilo' ill £wwti~1n1nu ol•.l'ioiontly ks i..n ix,t>lo1£a'Bion contre i:ina to onau1"'tt noru ra1.>1d. fJJ:.Ollllnt~ o1"" O,t>Ol'&:.t.ional 1ntell1t;enoo t.u.d. 1•E.1covo1"1os un uw·1•t111t. B)'at&.u1::1, 1 .. cu 111•1-.l ht:cu.11.in lltto !JI'0,61e>Ueu thkt l'.h:JPJ.C be 11niceu to J!acwa..s \Jy a raci!o ttilotJ,·.lJO o1.1·cu1 t via OUJ\w. Ht1 Ju.us 01·!

0

t11""ed to JQH.1.0 aveilablo the noceas&1·1 equ1pmont in Uni tud. Stat.ea . Yli thin 60 Cia'J'S o .

( b) A1•1•anuune.uts K1•e in lMir1cl now to 1l101•e.uae tJ1e e1"".f"icienc)' u:r tJ.1.e Ancieruon-Ji0lbou1•ne higb speod link to take 1t ,poaa1blo to "°'aoo an 1ncz·easi"G volume of operr:.t1ona&.l lut11lli1•or1oe between PhUllJ~C ana 1'1ltUEF Via i4elbow•ne e . '

Perao IVo llben tl'>.e i•adio telet~·pe 011 .. cuit lnsa bf-ten eatkblisned.,, t.he 'Ewo meln OXJ)lQi ta t1or1 centres I~U.PJ\O anel ftKlJE..." woulu htAve tlu'-oa channels ror 1nte1•oonrrun1c ... tiono

l c. .FltU'Eli' ... OUAll - P'hUPl£, oap1tcl ty or about 100,,000 GJ.•OU,l.SB - to be u.11ect .l'l'11i1c.2'1l~· to1· 1ntel"1ohant;e of !ntclliconco 1.r1Q .i•e.cc.ntt•r16a o£ cu.t•reut 111te1•esto

2.:. FltUJ§' - J.J::J,bOUl.?JM .. 1'1J.'(lJPJiC ~ capac1 ty ol' &bout uo.ooo r,x·o~a .• to bo uaeu J."01• ariy ove.r.t'lot1 or l.nttilll!~11ce t.ir&d J\flco\r&rifu1 11.ncJ. aa nec~aaai•)I 1·~l~ i•aw w. ter1A1.l.:.

3° ftlJ,tJJ.>JC - Hr.:.G/.~ - 31~'>..>L - Pl\U.IQ:o' to be u.ueci. aa neceaa&.1•y ii" tbe other two chum1e:;.a ux•e i"ull o •

TOP SECREr

DOCTD: ... 3678716

'I.. • •1 \.

P&ge ti 6

ENCLOSUhE B (continued) (CO!IJ)

.Para'L' v. (a) .Fo1• the 1r.va.ecL1ate .rutu1•e tbere will be 110 alte:raation in the oilat1.cio i·out111g of JJKUSA tr11.1·1°l<So

(b) In tb.e neai .. 1·uturo t1ll.ari the llelboui•ne-Golonbo c11·cuit can unaer- -take 1.t, !•'hUPJ\C and Fie.UHF. b:; mutual a!'J'IU'll~errsent,, •111 comr.&unca routiug .bh.US/, tra£1'1o via Uolbuu1ene,, wo1·ki.t1t~ UJ:' to a11,a1ao1 ty o!' ti:11a 11nko

(a) When O.U.t.J.i - J,HDRt.S~fl 2•11cliu telet~ .iJU is in O!Jer1, ti on •. b'hUPAC and F1'.UEF would i•oute lilUJSA ti•1d"i"ic by this cirou1 to

Para. VI eo RoutiI!G ot Tra.t.•r100

(a) FRUl>AQ aucl li'ltULF 1nte110llBI1L~ DA7~ and DISC t.1•K1"1"io,, 1n 11clci1 tion routi11<; tl.t.oi1• own ,l)l1cxiu.ot1on to tlIDAT wiu SKOOL retJ...,octively •.

(b) DA~E 1md DISC t.rnf'1"1o u1•1(~1nat1J:1g in tlnsbingtori will be passed to ~~U~~G klJQ GoCo & OoSo

(c) DAZH and DISC trn.r1·10 01~1u1natint; 1ri GcCo &: G.Sa will be J>&Saoct to \Yash111bton and. FhUl:':F o

{d) Ia.olbour.ne will &U,lJply its ,iJl .. odu.ction ot 1ntall1~senoe to Pl\UJ.>AC and PhUh"'P d11 .. oot wld will be a~pllod by ther.1 witb auob 1ntell1gE,nce as arrocts its 8J'8au

( e) Thia 1•outi:~; 01· t1•a1·1·10 will 1·011eve oongeatior1 on t.be. J\tla:mt1o channola.. l'.l.l tbat w111remain11111 be nush1.ugtcm and o .. c..,. & c

0s

0•a

own DJL~E ar>.d I>ISC t1•&.1"J."io •

.Pe.::·t:::. V!:. .haw mate1•it:ll .from b'li.UBP to be A)ll&sed. to WliSb.ington via 1'1hU.PJ,c wh'.en oondi t1oua allow. .

Parao VIIIo It 1a conaiue1•eci esseut1a1 to llkve 1m exclU1r1ge or Sigo Into ifaval-L1B1aon 01•1•1ce1•a 11t Pu&:rl Uu1•bour arid bidersono