. ... .. ,.. ~ 

SPSIS-8A 5 May 1945 

SUBJECT: Intelligence Report No 3 

THRU: Chief, Security Division 

TO: Director, Communications Research 

The inclosed report is forwarded for your information and file. 

1. Incl 

Intelligence Report 

No 3 

Declassified by NSA/C5S 

• 

Deputy Associ~' fo~ •.!!!!.Records 

o~J by f'LT · 

~.(.~ ' 

RICHARD L. DOV=t 

Major, Signal Corps 

Chief, Communications Security Branch 

K.-. .-.1.-..-..-.:+.: .-. .-J .-...-..-J .-...-...-. .... .-. •• .-. .-J +..-. .... .... .-.1.-. .-..-..-. 1.-. .. t...10 fl. .-...-. r.r. ..-.ir. ..-..r..11..-.i ..-. ...... .-. .. .-...-."'- "'-.-. r ...-... .11..-.ic..-..d 

I~ ...._ .... 

•1;·'), 

I 'f 
I 

REF· ID :·A72343 

-r~JiMH lo. 3 

15 lh.rch 1~45 

Clt!r'i'OG.l-;J.PHIC SECURITY 

!. Gf ner.!:l Studies 

l. Codes 

•• ilP.llO AND PLANE KOVE..iENTS COIJES 

References; 

(l) 17 AUfUBt 1944 J-Jl.J..;..3-A llEi.nila to ~aaile . (2) JO it~ust 1944 J-~9~~ llcnE-.do to Tokyo 

(3~ 31 ~Ue,--USt 1944 J-30017-D .Rr..ngoon to Tokyo (4 . J September ~944 C-957-B, D lleul:.do to 1'mila 

(5) 15 Sc;. temt£·!· 1944 J-20055-A MenLdo to .Ra.be.Lil 

(6~ ~5 Sc~temutr i944 J-.3~893-A Tokyo ~o Sinc~fore 

(7 ~J Su~te•ber 1944 J-Jll.41-B HeD.kow to Saigon 

(8) 27 Sept~mber 1944 C-969-AGHJK illenv.do to .Rabf:.ul 

(9) '27 So..,t.ember J.944 C-969-B-D, EFI Jlen21.do to Ha1:16.u.l 

{10) 15 October 1944 J-..:.65i.J Henicow-to ~-

(11) JO Moveiab~r 1944 F-J9871-A Pinr!:.Ilg.to Tokyo (U} 26 December 1944 J-lV+L.4-A-F Se.igon to llr..r1ile 

(lJ) 12 J::nw ry 1945 J-175Yl-A Pinrang t,o Be1guj.o 

(l4) 4 Fellru~ry 1945 C-915-G Pinrang to S£igon 

(15) 8 Febru~.r)' 1945 J-~5501-J. Pinr~g to S~igon 

(16~ io Fe:ibrua.r;,i 1945 J-~5647-A-B Pinr~g to Sinea~ore 

(17 10 Febrw.ery 194!:i J-;;!99.2-'-A Pinreng to Sincn~ore 

(lS~ ll Februt:r/ 1945 J -25773-.A1 H Pinr.uig to Si 1angha.i 

(19 ~ FebrUE!ry 1945 J-29£6?-A .Pinrang to Singa.,ore 

(20) 14 F1.bruery 1945 J-2650~-A-C Pinra.ng to Tokyo 

(2l.i 14 1'e-bruary l.945 J -:.6903-A-B Pinr;,nG to Tolcyo 

(22 15 ~~bruary 1945 J-:Z92JO-A,.B,IJ Pinrkng to Tokyo 

(:2J) 15 febr..u..:ry 1945 J'-2;:~)2-A Pinra.ng t.o Tokyo 

(;::4) 15 Febr;.u,,.ry 1945 J-;:.7045-A,H Pinr:...ng to Singa~ore 

(~5) 15 Febr&ury 1945 J-£955b-A,B1 ! Sinz~?ore to toityo (~6) l.E FebrUG.ry J945 J--'9J56-J~ Pinr&ng to 'l'c lcyo 

(27) 16 FebrW'..ry 1945 J-29)56-.a Pinrang to Tll.i.t1oku 

t~;l 16 FebrUbry 194~ J-... 9364-A-!i Pinrang to Totcyo 

16 FebrLUJ.ry 1945 J-.2:2231-ABD-H Pinrt:ng to Tox:yo 

.30) 16 February 1945 - J-J09S6-A Pin.re!ng to lliti.nldng 

(31) l 7 Febru~~ry 1945 J-;.9423-A Tokyo to l~Jlk.Ln6 

(32~ le FebrUf-.r7 1945 J-.<.9431-A Pin.rrnc to Tokyo 

{.33 19 Febru!:.rJ" 1945 J-~99Jl-A Tokyo to ltillkinc 

{J4~ 19 FebruH y 1945 J-~l5E.-A Pinrtng to Ts.lhoku 

(3; 20 lebru.::..ry 1945 J-30303..i.t.-b Pinr~ng to Tolcyo 

----- -- --------- --· --------
- . ------~ ,, ·-

(.36) 

(.37) 

C3c) 

(39) 

(40) 

{41) ,_ (42) 

(4j) 

(44) 

(45) 

(46) 

(47) 

(4$) 

(49) 

g~l {52 

(53) 

(54) 

(55) 

(56) 

(57) 

(5e) 

(59) (60l (61 

(l::.2 

(63} 

(64) 

(65) 

(t6) 

(E7) 

(6e) 

~*~l 

1

71 

7~) 

7J) 

{74) 

20 Febrw:ry 1945 

;:1 Febru!.ry 1945 

21 Febrw·ry 1945 

21 F~bruery 1945 

21 Febrw:ry 1945 

21 lt:brUtr1 1945 

:;a Fe brur ry 1945 

~2 FebrUEry 1945 

22 .FebruErr7 1945 

22 FebNf•I7 1945 

23 Febrllf'ry 1945 

23 .febrl.U'r]' 1945 

2J feLrw.:.ry 1945 

.24 Feht-Ubry 1945 

24 FebrU&.?"'.f 1945 

24 Fe brU5.ry 1945 ~4 P'ebruc.ry 1945 

24 f ebrU!'~r7 1945 

25 FebrUfJ:ry 1945 

25 Februe.ry 1945 

.26 FebrLUJ ry 1945 

26 Febr~.ry 1945 

27 Fe brW!.l'"'.t 1945 

2S P'ebru.:- ry 1945 

28 Febr~ry 1945 

28 febru~(ry 1945 

l Meroh 1945 

1 March 1945 

1 llerch 1945 

1 Merch 1945 

2 \larch .... 945 

2 ila.rch 1945 

5 urch 1945 

S JIP-rc!'~ 1945 

6 ~arch 1945 

6 llerch 1945 

6 llarch 1945 

6 llf'-rcl. 1945 

7 llle.rch 1945 

Cosle.ntsa 

J-JOJ::O-A 

C-971 ( ?) 

C-971-A-M,OUY 

J-30~'19-J. 

J-JOJ 37-1.-B 

J-31444 

J-.30557-A-l 

J-309.:19-ABD,F-H 

J-.31451 

J-3056J-! 

J-3;c686-.A-5 

J-31457-A 

J-3156c-A-D 

J-3156€-A,B 

J-31605-A-B 

J-31607->.-C 

J-31565-l.-G 

J-31560-A-F 

J-3216S-L-G 

C-974-A,B 

.J-J~:. 70-.A, G 

C-975-.A-B 

J-3~7JO-A 

J-J2E94-A 

J-J.3360-A-D 

C-977-E,F 

C-979-#.-D ,T.tiO 

C-981-J.. 

J'-.3J5E.6-A,B 

J-JJ2e4-I-lt,.iiNP 

J-JJ6ll-.A. 

C-9b0-C ,E-J.i.,11-I.E 

C-9c2-1,~ 

J-J5242-A 

C-963-i,O 

C-9~J-S 

C-967 

J-35181-J 

J-35261-A 

Pinrcng to Tokfo 

Pinrr.ng to T~inoku 

Pinrtng to Saigon 

Sraigon to 1"okyo 

Pinr!ng to Tck70 

Pinr~ng to Singe~ore 

Sings~ore to Tokyo 

Pinr1tng to Se.i gon 

Pinri:ng to· Saigon 

Pinrt·ng to Can ton 

Pinrt:nc to Tolcyo 

Pim·1·ni!: to Tol!.yo 

P:Ulr1ng to 5Rjgon 

Pinr1ng to Sajgon 

rin?'F.llf; to SR:tgcn 

P1nrr- ng to St :i.gon 

PinrLng to To~:yo 

Pinr~mg to Sa~.gon 

Pinr"ng to Tol:yo 

P1nrr~ng to Tok.YO 

Pinrr·ng to Toltyo 

Sr.igon to Tok;ro 

Pinrwig to ~ nl.tow 

Pinr3ng to St; l~on 

Pinrc.ne to SaLgon 

fi.nrang to SeLgon 

Pinrang to Surab~ya 

Pinr!.ng to T~1hoku 

Pinr~g to Toqo 

Pinraig t.o Cb.:i.tor. 

f'inNng to Ta U1oku 

Pinreng to Tbihoku 

i'inTt.ne to bh.eui.o 

Pin:r•t:ng to Tokyo 

Pinr&n~ to Saigon 

Pin1·b.ng to Seigon 

SaiLon to ~inrung 

Pinrsng to Ssig~n 

Pinrsng to Tckyo 

(1), (~)' (J)' (5) .. (6)' (7)' (10) J (11)' (lJ)' (~~)' (~(.)' (;:7)' (34)' (.36), (44), (49), (59), (69), (74). 'I'hee>e references give the ident.ification, 

1oca tions:, end movements 1 of incii vidW' l Air Force unit;; in the Pt. ciific area. 

(12), (15), (16), {18), (~l), (:3), (~4), ('5), (~E}, ('~), (Ji), (39}, (42), 

(4J), (i.S), (5.2) 11 (~3), (54), (56), (60), (c6}, (7J). T.t1ef1e refci'ences give 

arr1vf!l uld deperture figurea for plL.ne movements on Leyte,. iiiorot.1.1, Nunru, 

SUJ.sa.a>or, :.uzcn, Uindoro, Ling~yen, J.ngeur, .t'eleliu, Moe:::itoor, Bink, Kuraku, 

RoU.~~a, G=, ,u :re@d. m~t 
.(17), {19), (30), (J~), (JJ), {35), (40), (45), (46), (47}, (50), (51), (b4). 

1.'hese reference~ give point-to-point movements of phnes in t.b.c ,t)e.cific area. 

(20) SUl!llilF~r.Y or pl!-ne mo·ireme-nts and air etrength g&.ined. frOJll ; Intelligence 

up through 7 Febr-.ie.ry 1945. 

(41) SummPry or pl:.ne 1:1ovements and dr strenrth gained !ro::J } lntel:.1gence 

up through 15 P'cbrUE.ry 1945. 

(4) 1 (14), (j7) 1 (38) 1 (6?). Thee$ referer.ces give series of J-digit code 

groups reccTered. 

(65)t (6e), (70). Th.e~e references give series of 3-letter code gro~ps recovered, 

the plc.in-text &&llle as in Alf'JriO. 

{S) 

(9) 

{55) 

(61) 

(l.3) 

{5e) 

"TnE gist of ti.1e decrypting of the ,Americe.n J,ir Force trans~ort c.ircuit 

3-digi t code is aa tollowa: l-It is constructed in 2 p~rts,, tJ:.e !irst 

digi tB are code, the 11eeond are ( ?rto.ndom?) substitution t; bl.es. u Tb.e 

aubstitution t.1.bles are listed. 

•The pldn text comprit'les 400 ~o 500 groups. lumernls --)G-- 00 to 99 

end 0 --4G--. Besides the z6 le"tters it contE:.ins words with ve .. :-ious 

used {tnose with hlgh frequency) -.30- plans types, pl&ne ne.tie3, Met 

"t'Arbs. For solution we tock UJ.e code (?cu t.lle?) dey of the cod~ ch.E..nge 

as th~ beais (clear text). On the b~51S of repe&ts in the cipher text 

or one d&y's tr&ffic ln accordance with Z time, we locfited tninge 

identical to the IP sic clei:.r text and bro.lee the Bubstitution t£ble. As 

•an e~am~le or the first operRtion :h1 solution -JG-- Ln example of cipher 

text --50--. On lJ Septec.ber •••• n (There follows u list of J-digit 

code grou1>s) • 

"The J-nUlllber code used on the lo11ericcn Jir Force trai.s. ort r.m.' reple.cem.ent e1reu1t.s (Australie., llew Guinea, rb.ill.VtJinc Sectors) hf.6 been che.nged 

as follows since 1000 on the :..4th1 ~P'ebrlit.ry) The Philip!"'ine eectcr is 

still using the J-number code. 'Fe t:.re at pre::.ent investigs.tint: lresulti;?) 

of the oh~nge or tP-e unkcyed J-leLtar code ••••• " 

Arrivi..l nnd departure tisures for ph.nes et J:lollr.ndiP, Clark F.Leld, end 

Ilichols l'ield. "f~.,lcnstory note: since we (cl'n) u£e U'le coj·~ we are 

resuming the Sti}Julfi.ted !orm little by little.• (NO'tE1 This stipule.tcd 

term evidenUy ref1:.rs to the breakdown of tott..l plE:ne figures as described 

in e previous message. T"oe J~~tinesc were unable to ~~~e tnia bre~kdown 

tor 11 while alter the /.m.eriorn c0Je1> were cne.nged.) 

"Please re_.Jort the re:::lllts o! your investigation of the !ollo~.ing items 

ea ccntb.ined in -lG- Starr Intelligence aieseage f909. --lG-- CSi' 

{.t..ircrtift.) Coie, Syko Code, etc" •••• 

- "From now ont WU attached to the end of each (i 'tem.T) will ind.:1 cs.te tt.F.t 

it. is intelligence from E• )-digit code, and hUN tn~t it is int.elligence 

from a )-letter code.• 
(57) 

REF ID:A72343 

·~e have aucceeded 

•• had rorm.erly report~d, 

intercepted on one dey is 

this J-letter code tn.e BN 

lb- f~titig tne Wlke7ed tnree-letter cede, whicn 

amt the e.verbge number of' t11ese wires 

about 200 wires. Aft~r this we will calJ. 

code.• 

(f~) "The pl~in-text or t.he Bii code (unkeyed three-letter) usea by tl".e 

• .ltlerlcrui Air Force chtnged on ~6 Febr~ry•. Parts B-D, F, Ht end 0 

list recovered pJ.e.in-text tor J-letter code groups. 

(71} •'['ne 45 -lG-- mi code is e conversion t1:.ble for not less than several 

cU.7s. Because the number or messages th&.t this J.rn.y now intercepts is 

BJ:l:-·11,. we ere not yet decrypting t.heJ:t. 1 but we will re,,..ort u.e cn::.nges or 

the ~6th for rererence.n 

(72) np1en.se report t- sumum.r:r of the solution or the mikeyed thre:e-letter 

code mentioned in K~geyaid. Starr •ess&~e HJJe uid also the call signs 

and tre~uenciee or this ~lG-- oode•. 

Conclusions: 

(1) The .more fr~qu.ent chMLge of /!IRMO (instituted in December by 6btn AJCS) 

hes nei th.er prevented 1ior hindered to &.n &.iJprecieble degree t11e solution 

by tn~ Ja~~nese. For a ~eriod ct t~o months (i.e., until tne latter 

part or Febrlll:i.ry) they were ~ble to submit only ~&rti~l reports in the 

USW'l form, but are no~ resuming the com,t>lete bread:down in re~orting. 

Their metnod or :.;olutio:1 (atie Contents: (9) page J) used as outlined 

by tne Js.:;>£..ne: 2e is one of tue stc.ndard actt.ods of e.~proc.oh. 

{~) Infcz•?J&. t,ion is being requested by SSA concerninc thE.· new J-letter code 

being rerd by the Japenese and referred to as the BN code, wbic.r.. was 

first L,t>parent on 24 FebrW'!.ry tr . .i.ffic. The code is clearly Ii V!t.riation 

or ~IFJIO, k6 the plsin-t6xt equivalents &.re identic.s.l. (ARR, rEP, letters, 

figw·es, etc.). On the -'6th or Fcbr~ry tile ccnverdon tables were 

cht.ng.:-d ... and due to the sme.ll tlllount or traffic since tnet time, the 

J:!;.pcnese were not decrypting the messages e days b.!1.er tl~e; clle.nga. The 

low volum~ in trt1ffic iF. evidently t.tie eole difficulty encountered in 

reading tnc J-ltitter code, as, until the drop in tr~!fic, t~e plnin-text 

was aV&ilable in regular re~orts. 

b. 1'EA'i'ii!i.:R CODES 

8 References a 

(1) 6 Me,rch 1945 C-985-A..J Pinr'i.Ilg to Cc.nton 

Ccmtents1 

(1) 11Tue RF.Iii.OH (1st February -lG--) q code c.nd the weu..i.h.er code which l'iere 

picked up on the -JG-- BRISTOL-BEAUFIGhTE.R on l Fel)rl.lf.ry we have found 

out the follo~·ing points on (W.AF-J and UCOPA.C}. (1) Fig.iJter sectors 

~lG--C; Morot~i--Gyp5yJ Srnsapor--J~ckpotJ (~) Co~c ~ora •• • ••• 

(Code nG.es follow). 
--- -------------~-...__._ ...... __ _ REF ID:A72343 

... 

Concl us1onp 1 

{l) .le WAF-J ,per ae iB a code !or.m, unenciphered, cryptE.na.lysis i.f. unr.eceeaary fer 1 ts reading. Bowevar, l!il' er..ciphered on JRlHJSM.LT ta .>J.es, and 

UCOPAC, ere low-gre:ide weather ci~ers contidnin6 eh.ort-turm c·::mfidentie.l 

information. WAF-J is simil~r to J.LJtCO, E monoal~he.betic sub3t1tution 

cipherJ UCOPJ.C ill poly&.1.~aLetic. Security tests r.ave been m.~da of 

tnese two types by SSJ... It. has not been determined as yet wh1lt the 

connection is bc;:tween the •~att.er cedes and the neme code, but. the text 

permite the 1nter_pretation thst the JE.panese are listing info:"l!l.8tion 

gained tram the sever~l codes picked up in tne £ritJ.sn plf:.ne. 

2. Me.ohine Systems 

a. CORVEiiTER 11-209 

References• 

(l) 

(~) 

.30 August 1944 C-967-A-C Mt>.nila to Toqo 

11 Febru~r1 1945 IC-t-114 Intercept ~6chines 

AircrcftJ Extr~cts from notes of hllOC/~45; 

Source: Poles--Pt..ssed to StrorJ,c at S;t.AEF and to 

.Bicker. 

Con\ents1 

(1) To the Speci~l Intelligence S~w;.d. WFro~ now on (we) 

are ch~nging the n~me or the a-;09 to be the wz codea. 

(flithout stri!>&, lt is a di!'.ferent kind of mcnine c:ode.) 

PleE.se trr to collect El& mblly possible of t.i1e above 

telegra....,hic materl.1~1•.... •Tnis aee::is t.o be -2ii--

re,peatedly. We would like to study it so a& to solve rs.s 

much os possible before ti1e book chEnges•. 

(~) •The Gemrns &how t.lle following ciphers on the basis ot 

atudylng them ••• The smf'll American Civ.tiering Machine 

(209).• 

Com lunions 1 

(1) Fraa now on ta)e ~-209 wili be re!erred to as the Z code 

in ultr~ messages. The Jep~ne~e are tn:xious to obtain 

all possible tr&t1'ic in this systew., so that they may 

solve as much as poss1Lle before th~ book chl:.nges. 

('-) The Geme.ns have been studying the M-~09. 
---- -- ------

... 

REF ID:A72343 

.... _ ... 

b. SIGABA 

c. 

l!fsrepc;ee1 

(1) 11 FebrUE:ry 1945 lC-l-114 Intercept .tachines 

Aircr~rt; Extracts trom notes of IM.OC/.245J 

Sources Poles-Prsssed to Str011s at SliA!!' _ud to Bick.er. 

Cgntenta1 

(1) "The Germen.s know the folloring ciphers on the basis or 

attldying the.111 •••• Tne big Aaoricen eipherir1g JBaohine 18 

unknown to then but their experts are working on it.• 

. 

Cpnaj. us ions 1 

(l) Previous reterenceo to the •big macl.ine• io.dioate thet 

SIGA.BA is the one discussed. 

SIGJIP 

jeterencer:;1 

(1) 4 J&nuary 1945 l-~42'4-A-I 

(2) 12 Je:nuury 1945 .l-297.35-A-B 

(J) 1.3 Januar;y 1945 J-~5859-D-E 

(4) 15 JElllwary 1945 l-18022-B,C 

(5) 25 February 1945 J-J.3625-.l-D 

pgnteate= 

(1) (Part D) •Que or 6970 kc is used bJ patrol pl6ll.es in 

the llariuias. One or 6e09 kc is used by at.tti.ck planes in 

the Meril:!nb& ••• the &bove ere by telc~hone. At the present 

time it is difficult to identify tlle ones which usually 

cmttln informr...tion or value to us before t.he aally takes 

place. Up to the time of the enemy sally on 8tr. Dece.:nber 

l.944, we were eble to understand the .R/T used b.) enemy 

eirpl.s.nes end 6-ained accurate informe.ti<m in thie manner. 

However, after that date we could not depend on this. The 

11tUE>tion regarding telephones on attE-ct ple.nes is now under 

ety.dy.• 

(2) •Since .August sign.el comaunication by -lG- 43 unit &.t 

I.AMELA, BOEROE Island he.a been Jllllilled by radio W6V88. (1) 

Wireless telephone is being used but tht lansw;i;e_!! 

2.Pdi@tinct. (2) Telephone conversations, lasting about 

20 minutes, are orteu cnrried on et 1030 hours. (3) 

!'requencies 1 6 901 r:21 5. Whenever there 11 

a oonve~&11. Oz 1 •· 1 

' I I 
(3) • ••• RUFU (LUFT) 40 kilaaeters •outh or •••• course, 355 

degrees. (2) There has been considerable -m:e of pi~in 

text messages between 2 I ~lG-- end IT on New Guinea. 

(J} The time ot the sign.els 0£ Air •avig~tion Air Units 

at --lU-- is uncertain. There WE:.& interference on wues 

6990 kc and 5975 kc. The le.Bgue.gewaa not dei:.ermined, but there 

WUS a great deal Of wireless telephCDing in tile 20 mirutea 

a.tter lOJO. At the end tne7 sent P--OZ twice.• 

(4) •Al though the lflnguage ia not clear, they ~.re uaine r~.dio 

telephone. from 1030 there were many R/! cells for t. period 

or ~bout )0 minutes. Frequeneieat 6990 kc1 5975 kCJ sensitivity: 

s. At the conclusion or the conversEitian •PIOZ• was 1·epeated • 

twice.• 

(5) •(J) Although t.hc 11ignel oommunioations of the Morot!!.:i 

4etachllent hfl.ve recenUy b£en interrupted &nri the &it.11-.tion 

111 mknom, we think t.hd. they E..re egins a auieida.1. l>attlo. 

We wish to a&y in addition th&t we a.re ee.gerly worldn~ towards 

an underst~nding or their sigru;ls communic&tions.• 

CoPclusions 1 

(l) The preC6ding tiTe items, if considered as circumat&ntial 

•vidence, may be the reaction ot the Japs to t.ue use o! SlGJIP. 

There is no positive ident.ificntion at present the t these 

.retei·ences pertain to SIG.TIP 1 but, with the J apenese habit of 

notin£ eve:ey little detail out of the ordin~ry, some reaction 

along this li.De would be ex~ected. 

(~) The statements concerning the tele~hone conversationE 

that •tne lsngUE-.ge is indi&tinot•, •the 18l1GU!'ge Wt-IS not 

determined, but there was a great deal or wireless tE1lephoninc•, 

and Uie tEi.ct thtt, desvite th.is matter or indistinctrLess, they 

were able to underste.nd four letters correctly (~IOZ~ 11ay mee.n 

that this is their reaction to the introducLion of Sl.GJIP. 

However. if PIOZ is the indicator it. is in t.hc wrong l"lace 

aince it &hould be e:t t.he beginning of the converbat~.on. 

Moreover, unless the users h&ve 111>.de up their own se·:. or 

indicators, it should consist of a digra~h inste&d o:~ 4 letters. 

). Onident.il"ied and lliscelleneous System& 

&. nVE.-U:TTER CODE 

Beterences1 

(1} 25 Febrllllry 1945 

(«:) 28 Februe.i·y 1945 

,flmtentss 

CJf/4-A-B 

C-976-A-R 

PinrPng to Tokyo 

'Pinrb.D.g 'tO Tokyo' 
9 J ... .1)1 1-.l'J.p I , " 'J "I 

:•- • • .... 

1

'"'"! 

' .. 

..: 

~ 

• • 1 f I ~~ ... ~ .... .. . ~ ... 

• ... # - • ' 

I' " 

.; ...;,.....; .. 

(1) •At prescn~ we ore investi~ating ?results?) of ••••• 

5-letter double-keyed 5-letter code·in th~ Korot&1 end 

lew GuineE.. sectors.• The message refers to this co~1, as 

being in use on the ii.morici-n .Air ForcE. trensport. eind 

replacement circuits. 

(~) "l. The fH?t that we are not able to m.&ke & distinct.ion 

betreen trans.-ort plui.es &.nd m.111 ta.ry )-1lt>nes is because or 

a change in code end teoause we cannot deOJ'y~t (mesbages) as 

lone ~s the volume or messL~es intercepted is so elicht. 

2.. The .f'e.ct tlaet there hue been a decrease at 11.orote..i, 

Ssnsapor, Leyte, and Kiudoro, is because 1r1 ~ddition to 

conf'usion about the time of chenge of codes, they nave used 

• tiTe-letter code." (Tr~nslrato.-r's notes Tnis ia tt:.e tirst. 

reliable indlc!tion th~t the source or theee daily errival.-

depnrture rea;>orts is cr1pthll.::.lytic.. liowever, tne tuu 

decr-;pt (K.AIDOltu) used in this message does r.ot necE:Ssarily 

indicate a comi>letesolution or ,. code, tiut may indic.ate 

a pel"ti&l solution such && the aolut1on of & disori1linant, 

tile date, etc.) 

Copelusianss 

(1) The ch"'re.cteristics 11entioned in the mei;s1-ges indicnte t.hat 

the system being diseLJ.ssed is ei tr.er strips or Conv•arter 11-209. 

(2) ~ueriea1 

(J) 

---It these arc strip systems, is it ~ossiolc to r~1d out 

what particul.6.r systems are thus beinc compromis~df 

--It these are not etri1> systems, 1e; the code mentiont=d low 

grade or high grbde? 

--4hat degree or security is necessary ror tue information 

learned trcm re~ding these cocea? 

IOTE1 Information on this sutjt:ct is being requested by 

Siansl Security Agency. 

I.f i:. higher degree of security is required, there Ehould be 

a thorough investigation of the ty~6 or code used End wnat 

chE.nges can be made to incre~se security. 

-SlDf 1ma 

·-....:....-.::-
l 

.. 

t 

II T.R>.NSKISSION SECuRITI 

.i. General Studies 

l.. Broad.ct.st 

a. P..a:f'erences 1 

(1) 2~ Febr~ry 1945 J-29870-A-C Tokyo tc Broadcast 

b. Contents• 

{l) ~.iocording to a broadoest from Sen FranciEco on the 

19th, the comme.nder or the operational units is Vice 

Admiral (?Turner?) 1::.ud t.ae 16llding force consists of 

the 4th Marine Division and the 5th lle.rine Divii:;ion 

commanded by Lt. General. Hollend Smitn. 

c. Conclusionsa 

(1) Censorship of our news broadcasts was at fault, aince 

the information thus af'!orded Wa6 considered to be of 

au!ficient illportl5.llce thet the Jtpl:llese broadcast it 

.f'rm Tokyo. Prior to the news bro~ai,.et the Je.panes• -

either did not 1=osseaa this 1nfol'::ni.tion, or, if in 

possession, were not ~ositive of it~ accur~oy. 

2. Cell Signs and ~dio Circuits 

a. R9.ference'11 

(1) 19 Febrll!'ry 1945 ZIP /S>.C/ff .20 

Japanese: 

!~! 

ll 

10) 

{12 lll 

(13 

8 Jan'W:.ry 1944 

24 Jenuary 1944 

2S Je.nuar;y 1944 

7 April 1944 

29 111Py 1944 

9 June 1944 

10 June 1944 

11 June 1944 

18 June 1944 

6 July 1944 

7 July 1944 

7 July 1944 

9 July 1944 

C-235-D 

C-218 

C-244-B 

C-413 

C-862-J 

C-655-R 

C-572-H 

C-586-I 

F-2370t;-A.-F 

C-5~0-B 

C-531-J.-D 

C-757 

C-642-D-l 

Horomushiro Lo Sapporo 

To]cyo to li~ila 

Horomushiro Lo lt.wisikulce. s~~poro to Horomushiro 

Tokyo to lu;.ting 

SaJ:.ll>Oro to lloromueh 1ro 

Sapporo to Horcaush1ro 

Snpporo to Horomu.~hiro 

Surabaya to menado 

Boromushiro to Sa~}l::>ro 

hba.ul to ile11ado 

11£.nila to -M--

P.abc. ul to Tokyo 

' \ 

\ 

\ 
' l 

14} 

i~~ 17) 

f~;l> (.20 

(21 

{22 

(Z3) 

(25 (~4l 

(26 

(27 

(:a!) 

(29) 

(.30) 

(Jll (32 

(.33 

{.34) 

f 

35) 

36) 

37) 

(JS) 

(J9) 

mi 

~l 

~~~ (48 

(49 

REF ID:A72343 

l~~ ~EC~H 12 J'uly 19.44 

lJ .Tuly 1944 

14 July 1944 ~J .r uly 1944 

;,3 JW.y 1944 

27 July 1944 

2c: July 1944 

30 July 1944 

31 July 1944 

10 .11ugust 1944 

15 October 1944 

;.1 October 1944 

13 November 1944 

15 IOV'em.ber 1944 

21 November 1944 2~ November 1944 

l Jenu.'lry 1945 

7 Jnnugry 1945 

13 Jrnu~r)" 1945 

) febru&r.t 1945 

4 Febru~r,:, 1945 

4 Februrtr;r 1945 

f Febri» r.r 191..,5 

10 Februfry 1945 

14 Febru.F.ry 1941 

10 February 1945 

15 FebrU"irY 1945 

18 f ebrwcy 1945 

20 Februf.ry 1945 

2l. Feb~u~ry 1945 

24 FebrUE:l.J 1945 

28 J'ebrUPr.;r 1945 

28 Febru~r,y 1945 

;;:g Febru~~ry 1945 

~ Bk-rch 1945 

4 March 1945 

b. Contents; 

Ge:rme.n: 

C-S35-J.., D 

C-5C:O-B 

C-7.20-B 

C-695-J.,C-E 

C-626-B 

C-516-D 

C-7El-B 

C-630-.A-O 

C-Oi+J-B-F 

C-847-E 

J-.27059-A 

J-l.Sl97-B 

C-895-! 

. C-9;:0-J. ,H 

C-9;:.3-A 1 H 

C-901-E. 

J-ll643-ABE 

J-16208-! 

J-2467'J-A-DG 

J-ZJ127-A-C 

D-9340 

J-2-4097-A-C 

J-25364-A 

J-~5360-A-H 

J -'Z70 37-C-J' 

J-369.30 

J-JOZ9~-F 

J-.22208-1'--K 

C-97;c-f.-DGH 

J'-J0~99-E,F 

J-31565 

J-J2'7;28-EC, E..Jil 

.T-3'910-J. 

J-33305-E,F 

C-981-B-C 

J-35259-J; 

.&.haul to Tok.yo 

Sap_voro to Horouti1shiro 

Tokyo to ilanila 

P&rf:t!!lushiro CoJlllll•.m1o 

116.nil~ to Tokyo 

Tokyo t.o Asbon 

li6.Iloi to iienkow 

•~ilr to Ra.br£ul 

P~bc·.ul to Jllenado 

MenEdO to Sorong SurabLj~ to iinr~ng 

Tokyo to f;,nbaul 

Tokyo to Bro~da6&t 

Surabliyc to Pinreng 

Rabaul to Tokyo 

Tok.yo to ,ljroedc&st 

Suri: ba.ya to Saigon 

Pinrr.nc; to Tokyc 

&.ngoon to Ke cE E sar 

Re.b&ul. to Tokyo 

Tok;ro t.o Berlin Pinr~nr. to Stigrn 

Pinri..nc to Se.igcn 

Pinrane to Tokyc• 

Saigon t.o Taiho~.u 

Seicon to Pinri..r .g 

Biite.vi:. to Pinrr ng 

Tokyo l.o Hroe.dcutt 

Pinr1:z.11g to Ta.ihoku 

Pinre.ng to H.ankow 

Banking to Pinri.ng 

Taihoku to Tokyo 

Taihoku to Suigon 

.Pinrt.ng to Xi..ni::i.ng 

Se.igon to Taiholra 

Pinrene to s~1~1Jn 

{l) 19 Febru~ey 1945. It is clear frcll tirst-hmd Germe.n 

SIGINT re~orts thet the enemy derives much iet&iled 

informhtion on the subordination 1:111n disl-'of..itions or 

.lilied troops and units from our own signals.. The 

enemy 1& very furl.liar with U.W. cover nfiilles. This 

report gives cover nlimes used in the Jrd end 7th 

.Americrm armies and sol:l.e fro;:i the lat Frenoh Army. 

- 10 -

lO? ~ffiRtI 
.. 

.. .1a.,&nese1 

REF ID : A 7z3:-43---· 

Through WiT tratfic the er.c:my locE..tcd the 7t1 Army 

Cor,ps in the Odeigne~oche area i:t one ti1na. 

Thii; entire re.,ort gives locL:.tion and identif'ieetion 

of Allied units, opcrr.tion pls.ns, time of interce,e>tion, 

cover nW11es, bl:.ttle ordere, loc~t~on of ~/T and control st~tions, plain text meE~~ges intercepted. 

One signal picked up on the evening of ll JsntW.ry 

rerers tc an o~er~tion by Unit 22 to t£ke ~lace at 1100 

hours, end which wi:s to be ke~t strictly eecret. Tnis inst~nce si1ows a decided lack of security-mindedne~s 

on the pert o! the Allies. The re~ort goea on to &&y 

thet the Germ: ns identified Unl t ;,.;; es the ~:2nd In.ff:llt.ry 

Regiment oi 4l.h Ir.fE.D.try L'ivision (Ait.ericr~n) • 

(1) Je.pa identif;y call sif;Ils a flGT--Dl.lt.ch Barbor; 'RCI-Kulult 

(2) J ~s identify call signss V5AI--f:lr1sb&.ne 

Vl'iLh--i4elbourne 

VZiTV-Ti:.nobiru 

{J) Japs identity call signs on We~tern .Al£utians shi~ circuit 1;1 

IPS--?eerl H&.rbcr 

IUD--luluf. 

llXU-liska 

IZL--Attu 

(4) Jap:> au:te thet. it is difficult to determine the maximum miliury 

•trength btc:lUse or Ut.e use or ctll signs .. 

(5) Jepe iC.entif7 1Wl'E as Ei call sicn used between ICun:ning End finsuk:ie. 

(.NOT:E.1 ~lhE iB used by 6;:nd A.ACS e.t Ch&bUE' .• } 

{6) Jap& irlentify Z5T Lnd 26Z as connected with Soutt1ern .Air Coeand. 

(7) Jfps iaentify Z8A &S rel6ted to the XO circuit. 

(8) Japs ne"r Z3F on •1• circuit, filld believe "Aa circuit to be in eastern 

pe.rt of Southwest Pacific. 

(9) Tne Jestern Australia patrol circuit used call sibns whicn are generaJ.ly use.~ by :.a trol ships ond submarines. .a.,,pearance cf the~e ce.11 si£Ils 

on E.n air Ji6. trol circuit is most unusual. 

(10) J~ps are collecting items &bout the Northern Nevy Trui&kort. Ple.ne 

circuits, the COUl"Se or trrns.a-ort pltnes betwe~.:il 'lLSita., Dl.Ltch Harbor, 

and XulUJt, ~nd evidence e bout h tsuw~ .. Shime.. 
.. 

t -

,., ·r 

-,. 

, 

·. 

.,. 

·. 

.. 

_, 

, . 

.. r 

REF 

(11) Jt:..ps st.ate th.1. Uo. 1 and 2 circuit1;; in llew Guinea area are being 

interce,;ted. Their :frequencies !:.nci C!.i.ll :.dgnc do not cn1mge. 

StPtions hee.rd i.re1 

V"rlZ--Port acresbf 

Z4W--Goodenough 

IDZ~Emirau Isl.end* 

IWE-:.:unde.• 

GU-e-Lorengau 

J!IGN-Tt:.rold.m::• 

"VJJ--Milna J::.ay 

{12) Jt-ps request a re,t:.ort on clrcu1ts, c&.ll signs, and ld.locyclf·s, or 

eh1pB located at Lorengau, PCCOrding to ncn intell1cence. 

(13) St .. tlon:.; heard on the Solo:non1 s area sbip circuits arei 

IGK--Gw.dclct.nal 

BDZ*-F&erald Islr.nd 

BGE--Te.roid.l1E>. 

(14) The number or ships lo<t11ted i:t Lorenguu on .28 June 1944 was 

eatuat.P.d from the sll1p1& c&J.l signs. Two anip circuits in the 

lew Guinea area have not wianged call signs. 

NGN-Taroldne* 

{15) ¢¢ 1n 1:1. cell s1gn indicates assigm:l• ... nt of :· ship to e. carrier or 

it& b;.:se. An •r• mctJJ.fC: the pJ.bnc is an •Eiirwaya" .i>ll!ll'.le. Bum.bars 

atter the V lnaicate the Phip's n~me within the unit. 

(.Lt) 

(17) 

{l@) 

(19} 

Jave inentify call signs on Eastern Rew Guinea circuits; 

14W--Hollandis. 

IGS~>dmiralties 

VJJ-111.lne Be.7 

Cancl~ions or HTF Tokumu (Special Sa~ce) Hr-.ncho (Sectior Leader) 

regarding aall signs connected witn the lU and Z numbers r.re1 

(e) 

{b) 

(o) 

KU oiJ..l signs trom the northern area. appe!.r to be call eigns of 

prominent commt.nding officers. 

The 2' call signa trom the AJ.euti:.ns are c.losal.y relt tE·d to 

large operetione. On tL.e HA circuit Z5T1 Z6Z, &41, etc., are clearly arriy high-

•peed bettalions. The cell signs are considered to bu specially 

eet-up cell signs or the Sout:.hes.stern or New Guinea a1·eaa. 

. (NO'l'F 1 2 call sie;ns used by the •~vy Ere assigned 101:a.J.ly uid 

are :made u~ or Z-number-letter.) 

Japs believe ca.Ll. sign 5C5 to belong to an airorart carrie::-. 

Japs ident1r1 call eigns1 VF9--Isrlsbane 

• 
(;.o) 

(21) 

C~ll sign or some llllit in ~ei~ir.g, nsein, ~w~ngtun' Province is PCR. (ROTE~ tr.1i~ e1:.ll sitn ce.nt1ot 'be identified at ,;;.1·ese:nt .) 

J a*•ll identify Cti.ll signs and trect uencies 1 

Ul.D--Port Morosb.Y* WXXY--Finsehnfen 

dey--6950 kc night~Jl30 kc 

Patrol circuitsi 

TP6~Toi Isl~d QJE--Wakde 2AW~B1ek 281--Holl~ndi~ 

LIO.A, LKJC--~ubmarine tenders around Bi6k 

Atterican J.ir Forces Transport circuit& 

l'IID--Port koresb:f* WIXT--Bun~ 

WXXI-Finscnafen WXX~~Horn Isl~n1 

WXXW--Ho1landie.* WZPT--Mo!aa.er 

WXXM-Aite.pe* WZPQ-l'akd.e 

WXXZ--lledang WZPU--Hoemf oor 

.lt.t".ck circuits1 (used in rotetion) 

BL6 DU9 1341! BG4 

BS.3 BX4 6VK. BHe 

Air i.rm:y le• Guinea atthck aree 1 (used in rot!!.tion) 

Bi~k Be.sea ~akde beset 

IJ.J 6DT 

3HO 7ZH 

5RC Kc;2 

H.A2 5FX 

21fl IV6 

IP3 133 

4FG 4RV 

5G8 75V 

(22) Japs identify call signs1 

(2.3) 

(24) 

(26) 

(27) 

(2~} 

24LK3C8--lll1 aircru.ft c~rrier at zlort Moresby ITF~Ada1r~lt1es* 

BAP--&.nsa 

VBZ~Port MoresbJ 

llI--Bia.lc and D&.rw!n 

J&pa ~dentify WXXQ as being aomewnere between the Horn Ielei.nds 

&nd ll~din. (llOTEa 11. is co.11 sign tor Ll::e.) 

J&.pll cite call sign .BI..22 a• in the vicinity of Morotai, beuause 

its aziaut.h is 208. 

Since boabing lknchuria on 26 September, when e flig.b.t of raiding 

pl.&nes ate:.rts ou.t it •ill elweys uso a 4-eroup ctll sign, 1lle first 

t•o letters being CT or mr. i Fre~uency used by Allied at~ack plwies is 7365 ko. ( 

Sl~ce 13 lovenber Japs have ~ickcd up & tender with cf.11 sign LKSH. 

-- --- -- - - ----- - ---- -------- -

,, 
,,.---

f_ 

(29) J~pa identity WITA es e central Pir stetion in the M~ri~n~s. 

(JO) In the Xorota1 a.ro;E>. 1 ylenes with call E>igns in the form of letter1etter-di&i t-dig1 t arG ~tteched toll.JD end !lying boEts with call 

signs ot tnree cnar&cters are atttched to BG4. · 

(31) "It is considered it correspODds to the unit bee.rine the cell sif!l 

nuat.er-V7b-nU111.ber, which n&s been ~articipating in tne att~cks en 

the Philipyines and is now bcsed &t Ang(.ur". (MO':.E.1 Tllis unit. 

referred to is presumed to be u.n aircrctf t ce.rricr) • 

(3~) identifJ call signs in Indi.r1-Chin~ 

('IX• ~ext) A t.b.rough Z 

(lfUT text) A tl.lrougt~ A 

(WL? text) A through I 

(WLR text) F,I,11 5 North Hurme 

(•LS text) F (Chin~) 

(WU text) D,F ,J ,N (C!lina) 

(WZP text) B,D,E,F,G,H,I,M,N,O 

lfXIA is Kue.chi. 

tr.!:!ns;1ort net: 

end Cbina) 

{33) 11Redio ctll signs of B-29 control sti:-tion f·nd plenes ch1:-ng<·d Et 

06)0 on J FebrJ&ry. Former OOV5JO (Seipan) c.."langcd to OOVE:05 and 

pilnes formerly number V5J eht.ngcd to number VGO. Former OOV535 

(Guam) changed to OOV755. 

(34) 

(J5) 

{.36) 

(37} 

(.32} 

Jape identify ctll signs for ~eteorological relay •tationa1 

Glll!m--1'PH* t Honolulu--!Pil* 

The rej,iart orders &fgon to 1I1tercept AJ..F vatrol circuits, place 

names, and Cb.ll signs. It.. e.lso 1dent.1f1es1 

llorotr, 1-..;;:.G4 

.Ange ur-:rlvNF 

Leyte-JJU 

111ndoro-(sx 

Code nE.JDes for bases1 Uorotai..JBLOO~ER 

Lingayeni;i~.NEI 

Leyte--Ct I 

Reiiort on air bases Jnd atrivs in the Philippines and on ;a.,roti:.1. 

Some heard h6ve not t~en placed as yet. k\lzon--covern~~es of ~in~y and Go~tee 

L-e1te--COY8l"D.bmes or Clipper end Velvet 

lliudor2--coverncmes cf August~, Hamn;.er1 Bill, Chs.rity, Ella~re, and 

lnguire · 

I 

lgro;ta!--co~ernsmes cf S~efu, Eloomer, Curfew, Junebeii, ~Lndy. 

All : o nil signs. in thi ' Phill::~ Area will be nrorted to t.he .ilankow 

.... -~.r-·\ r-, '.f'ffillfll~·:r ! . ; \ 1 • - ~ 
---·-----,---.-,-

Bpeci~l Intelligence Dept., and tne Ce.nton S~eoie.l. Intellicenee 

Dept. The he.nkoir De..,>t. will ottrry out actively and directly liaison 

a££airs rel~ted to USAAF in the Phili~pinea. 

(J9} Japs identity call aigns 1n Jew Guine& areat 

IVNF--,1\ngs ur 

28X-tlindcro 

(40) Jape have idenUtied some t.uzon besed p~.nes '18 tre.n15port1::1, thr::>ugh 

their el:'ll signs .. 

(41) From docume~ts captured in pl~nes snot doft'll~ call signs or the 56th 

Tesk Force oper~ting in the Iwo Jima area are: 

lett Group 

Hornet--Shasta 

Wasp-Spider 

Bennington~Legion 

Belleau ~ood~LocusL 

Jrd Group 

Es1.;ex-Bobc,. t 

.Bunker Hill-Tiger 

Cowpens-Cccker 

2nd Group Lexington~Devil 

Bl'ncock.......Sambo 

Sim JE1cintc-Lucky 

4th Group 

!orktown--Cobrl2. 

P.andol~h~PhantOl:l 

Cabot-Ponti&o 

L2.-ngley-DeJ?1on 

ith Group 

:Er:i.ter.-.risc--Texaa 

Saratoge~Beaver 

{42) C11ll signs or AJ..F trE.nsport circuits which the Ja:ps int.crcept in 

the Fb.ilip~ine area &rez 

lst Circuit 

WXIR-llindoro 

WXKY--Ling~yen 

WIKQ--Clark 

1'I.1CS--Luzo.n 

WllR--Kollandie 

,4th Circuit 

1ilIR--M1ndoro 

WZPS-Morote.i 

}rd Circuit 

WXKR--Hollt..ndia 

UXK:!--Lingayen 

. 5th Ciro u1 t 

JiXKR-Angaur 

WVNF--

{code names durine; di.y--·~muc) 

(code names during niiht--LYRIC) 

6j;.h Ci.rcu.i t 

{code nescs during day--Paces) 

(43) J~~& identify \l"lKQ as Cl~rk Field, Luzon. 

(44) This re;ort reque.sta sn investigation of CE-.il signs end frequencies 

used by A.AF, which e.dvi:.nced to the Phili_k)yines. 
l 

' I 

! 

' 

;'.;l 

(45) •Tne following a.re lfhet bas been ascertained about call signs, 

cede nem.es, and trec;.uencies or airfields, according to docze.1 ts 

on the S-23 shot down on 18 !'ebrUE1ryt 

l. Oui Isle.nd-BLINJCER 

2. .309th Bom.bine; Unit--POSSl'Cl 

J. Bie.k-LORDSHIP--:l.okme r Field 

4. 11.AJ. airstrip-DEX.TE!<. 

(46) Japs ident1!7 code nemesa 

loemf'oor-DRAWBRIDGE 

lamiri Air!ield--l/iltAS~REM 

lorotai~GYPSI, APPLAUD 

We:me drstrip-BI.oo:.i!R 

(47) Japs identify sdditionF.l code nEmesa 

VELTI.'T--T&nuc.n airstrip 

PXIBALL--eirstrip on aindoro 

FREIBOOTER--eirstrip on Mindoro 

BA'n'IAN--Subic .Bay Coast 

B01UY--:k.ng1.ld&n rs.irst.rip,. Lingayen 

DOODLE BUG--Cl&rk Field 

ll&IF.ALDBOLSTER--Hollandia 

TIJMDLER--BollBD.dia 

BROCADl--Hollandia 

E!.BOW--S&.nsapor 

(48) The J'apanese nnt the follm.iing infometion regarding a 05.'>tursd 

code book 11Sed on pl&ness 

{a) Do .lmeric&D plrnes ohe.nge ct.ll ~igns dE..1ly and tbe ti!l.e of 

thcs che.nge? 

(b) Number of pl&nee b",t Cf'.ll signs (unit !lBmes). 

(c) Are tho patrol pl.&nes thet U&e identiccl o~.Ll sign~ 1dentic61 

plenes? 

(d) lfb.tAt ue the pecsulluities by which one distinguiisne11 pat.rel 

pl.e.nes tror. tlying bo&ta, from t1.1e call sien ~oint of view? 

(49) '!' Intellig~nce reports tb.!'t •the Air Arsy en Leyte consists of 

nine regiments. There e.ro strong indic,.tionfl or 2. move.m(nt up from 

f.inach.p,.fen•. Jn air &trip in the Morot&.1 area use& the aode nr.me 

tr.AVffi. 

c. Concludons 

(1) Sut:lllirry or cr:-11 :signs reported by the ene111y wnich 

a.re correct, es f&r as a.1ecldng is ~ossibJ.e !. t present: 

- 16 -
. ' 

(Et) 

{b) 

(c) 

(d) 

(e) 

(r) 

(g) 

(h) 

(1} 

(.i) 

(k) 

(1) 

(l:l) 

(n) 

(o) 

REF 

I ' ' 

~ l!JJU 

211'"--fsie.k. 

BDZ~'U:iir&u IslEind 

NGN--Te.rokina 

11UD--AdPk 

lHl'E-Kund&. 

WUTE.--ChabUl:. 

1'X.KY-Lingeyen 

Wl.XD--~ort Moresby 

Wll.¥.--Ai ta_i;e 

WXXW--ilollE<.nd1EWZP'---1'akde 

WZPR--aiddlebl.l!'g IslE:.D.d 

WZPS--Morotai 

WZ.t" U--M oemtoor 

V.AZ12-D/P' net &.l Dt.rwin 

(~) Out. present 0211 signs s.y:at.e:m em.t..i.ar tLe ene::y to1 

(a} Determine tne origineting end rEiceiving E"btions 

rron. day to da;;. 

(b) Sort traffic eecordingly 

{c) Follow re-tr&nsmit~ed ~esseges, and to •t~hc~ 

cryr1tan.alytically ,t)OSsible re-W-~usmittcc messege encipt.ered in E differen~ systew. 

(d) lb·ke recomc.endatione on signrl counter-ir.Easut·es 

to be teken to avoid collllhiesion of error:: similar 

to A.l.lie..d errors resw. temt fro.in weunesi::.c s in 

cuJ..l. sign system. 

(J} The use o! fixed c~l..L signs bJ t.ne Army, wlth the 

tirst two letters distinguishing the area where the 

tronsmi t ter ie located enable tl'ie enemy "1 wout 

difficulty to: 

(A) Compile and 11.e.1nte1n aecuri..te di&.brl..llls of all 

our fixed networks. 

(b) Direct his intercept atc.tion:; to the tt.s:ts 

allott.ed 6.nd to delete whet inform&tion :ts 

lllm!i.terb.1 to the co1:1.k'lF;tion of tne ai:.si{;ncd 

task. 

(c) Dist.inguish rapidly the ore;..tio1. or new 11tt: tions 

in en area. 

(4) Fixed call •it.n system also a.ids the eilelJ.1' s crypt-

&nalysis in the following w£ys1 

••• .. I 'CE•f: 
I 

( 

I 

i 

[ 

i-

(a) 

(b) 

(e) 

REF ID:A72343 

ri ffit '. :-=,r • I t. • I 

rJ 'ii .. i 

J.. ri:y n scret~on or- -COl!l_tjrc:mli:!.e C&ll be COllpiled 

by sth ti on. 

Routine messages can be collected. 

Ca~tured files can 1'e exemincd and compered with 

earlier intercepted tr!.ffic. 

(;) Tra!fic E.nt-lysis bJ ct..11 sign,; will show rad:l.o silence 

and Volume I tnere by indice f..ing !ltOVe,;.&nte 1 Bi::e Of 

uni ta 1 arr1 vals 1:.nd de1,artures, ano the gene1·&.l ares. 

where reserves Lre located. 

(6) We know rrcm captured documents and other so.n-ces 

that Germ!'n 6.nd Jt.i' intercept atetion1> re.:.~der- daily 

reports of subordinate f orm.Ei tions er uni t.s, tnus 

aiding thiir recorda or our Order or Battle. 

(7) The differences between our J.rmt Bnd Air Force call 

sign syste~s enables the enelliJ' to &ssign •~eoific 

tasks to his many in tcrcept e tt tions without qverlappinc between them. 

) • ln tE~rcept 

(1) 

(2) 

(J) 

{4) 

(S) 

(6) 

(7) 

(e) 

(9} 

(10) 

(11) 

(12) 

(13) 

(14) 

(15) 

(16) 

(17! (18 

(19 

(~a) 

(:21) 

:~z) ~,?) «...; 

(~4) 

(;::;) 

a.. References: 

';.7 lay 1944 C-311-A Re.ngcon to Toky•> 

~4 June 1944 C-5~9-B Sapporo to Hora1ushiro 

J July 1944 C-717-A Sapporo to iiorcuushiro 

6 July 1944 C-5:CO-A Se.p;>oro to Horo-mshiro 

l~ July 1944 C-SJ5-D Ftabriul to Tokyo 

14 December 1944 J-27533 Kanile to Tokyo 

26 December 1944 J-13E01-L,b,E Seigor.: to PinrBne 

4 Jttnue.ry 1945 J-~4224-A*I Tokyo to .heb~:ul 

29 J6nuer;y 1945 J-,189i-D,C Tokyo to Broedc!st 

4 Februa:cy 1945 J-24f.117-J..-r. Pinrar1g to Saifon 

6 ?eb~~~ry 1945 J-~69JO Seigon to rinr~ne 

10 Febru.ery 1945 J-~6930 Seigon to Pinrtng 

l2 February 1945 J-26907-C-G Tokyo to Broedc:l:!.st 

13 FebrW:!ry 1945 J-~6~06-C-H Tokyo to l:iro&dc:&.et 

l.:: Februery 1945 .J-25E:76-E Tokyo to Bro~:.c:l<:ast 

14 Februe..ry 1945 J-~6500-A-ti Tokyo to hrOE:.dut.st 

15 Februe.r.r 1945 J-JOA.9::.-F &.tavie to 1·in:•.sng 

~O Febrw>ry 1945 C-972-A,B P1nran1 to T1.1.i.lloku 

20 P'ebrui>ry 1945 J-30.;'.61-C Tokyo to .broe.d·:1:tst 

21 Fetruery 1945 J-,9670-A-C Tokyo to bro~dl6St 

23 FeLru~ry 1945 J-30406-!-G Tokyo to broad3~st 

25 Febrw;ry 1945 J-Jl055-A-F Tokyo to BroadcHst 

25 February 1945 J-JllJO-A-D Tokyo to broadcast •; :~·,5~ iifi~o t:O!~~!o 

m - .. _ ........ ....,w_..,.,._,__. ____ ..... - .. ~-,..._ -._ .. ":!"' .... 

- 7 ., ~ 7 f I • ~ .? ··q FF 
b. 

I 

~ 

I 

r • 

~~~-------------------......... . 

REF ID:A72343 

Contents1 

{l) '1.'L.e J Aps e1:<y the 1ici t61lCl'liku Shirei bu is tnc J argest 

communicr.tions net on an es"ts.blished circuit t•ince 

they begPn intercept.ing Allied tri:.rr1c ... They h&ve 

decided the supreme cOlllDlnder of th1;; circuit at 

Honolulu is also t.he comrurndcr et luluk. The report 

orders a clo~e w::tch for cnuiges in ~~P. net. 

(~) The Northern tliroshime. Tsushincho J.n:.eric~ lnL~ll1-

geneei "We hear forci6Jl at1>tions r:s if -r:e were P.n 

ordinfry receiving st~tion". 

(J) T!le J&pL.nese Judge tram rc.dio t.ele.;m.011'!." serv:i ces £ind 

the Honolulu b.rotdc::sting net .11.e:;ssgc5 thr, t tJ1ere is 

presence of ~enomena comrerE:.tile to tt&Elt v1.Uic:b e_lli-eared 

prior to t.he ~ttaak on Saipen. 

(4) Genernl ship circuit which the J pa interce_ti;. communica. tes with s tL tions nearest to the ships: 

WaBhinaton, ~ Frbnci~co, ri.onolulu, Dutc;1 H:Lrbor, 

Cs.nbol'N!., e:tc. 

(5) Jbps intercept mes::;.~.ges from ste.tions located at 

Port lloresb,, Tarolina, Finsc..":1afen, Pnd. Killie "ay. 

(6) Summery or OperL>tion!!!l Orders A. C.O. Soutrern Army 

Speci"-1. In t.elligence .bureau must estf blieh :I.mm.edit;. tely 

an orgt.nizbtion to gt-ther Britisn,, AmericE..D.1, Chinese, 

and French intelligence, covering nn area ti> tne north 

and e&st throU&h interce_f>t. This arce is p:·esi.lli11?.bly 

to the north and e est of tile Philippines ar ~a. Tne 

llsnile br&nal. will ocmprise most of the tralned 

personnel at precent, end the number of men to accompany the C.O. to Seigon will be tnc miniRurit necesserr Lo estbblish a heedGue.rters cadre (less then five 

:z:1.en). 

(7) By 1nterce"'t lll.tellir;ence, the Hornet, W&Sl'J and one 

unidentified vessel were knom to be ee st c1f Luzon on 

14 Dccem'btlr. 

(E) Enemy •~s abl~ to detect .AJ.lied-plE..Uned avtlies of 11&.rlane.-b~ sed .B-;(9' s up until b Decet.iber t,1rough. n./T 

used by the planes. 

(9) Intercept. of :mes::ages from San Fr~ncisco on ;i._7 J .. nUP..r-J' 

to the effect:--•It is ~ossible to bomb T61wan, the 

Ryukyus, Chin~, Frenot.-lndo Chinr;, t-nd Sing&t>ore as well". 

...................... _________________ ~~~-
_. ............... ------------~-

REF ID:A72343 

(10) 'fhe J£~s are ordered to interce,t1t J...>.:F patrol circuits, 

pli.ce names, and cLl.l signs at Morotu, J...r.ii~ur, Leyte, 

and Kindoro. 

(11) On 4 Februe.ry, in the oentrb.l are~, 3 RQP messages 

were interce..,ted. The;r looked li.1te ordert:: t rol:l 

centrn.l he~dqw:rt~re, addressed to a eenerE..l aL.Ll sign. 

One w~s sent troc GUh.111. 

(1;.) Thi~ report gives tne latest cal.. BibOS wid .~r~~ucncies 

of &ir buses in the fhili_p!>ines ar.::e to the llankOlf 

and C~r.ton S._eai.::.l Intelligence burbaus. ThHse 

bureaus e.re to ce:rry out direct.ly uia s.ctiva .. y tr1e 

liaison effairtJ relllted to tl1': USAJ . .F in tile l'hili;'μines. 

(lJ) Four B-29's on reace ov&r Iwo Jime. sent •011 111essage 

wbich appeared to be recce re.a-·O.et, to "ovcr-i 11 fleet 

commander in tb.e P&cific aree. (centrLl} a..r1d t.o the 

section comm~nder of all su~rrinc units in th& 

Pacific". .Radio w£>.ves for patrol .,1u.1es froi: Wle 

llarianae • lie.rshe.ile, E"nd PE.lau wer1; ~11 mede 011 this 

day. 

(14} J&ps intercetted ~essage revortin~ t~c sightin.g or 

J e.~ese uni ts by ,tl& trol .,lt.nes froe· t.he Phili_yyine 

aret:. ln..ses. 

{15) P..t 1700 hours on 11 Febril.t:..ry1 4 L-~9 b i:>eut O{!er,,tional 

9£!1:u::iir;.ges1 whici1 1iere thought. to be mes~Et.Dcs c:incerning 

reconnaissE.nce of the lwo Jima ar~~, to the C:m&nfnder 

of the Pacific eubm.arine unit. t.nd e. ship et~·tlon in 

the centrc.1 area. 

(16) Inter~ept of dai.ly nou mess~gea from twc t~ks forces 

&nd &.ase.ul. t uni t6 ill the •~·rianas &.reu. T"ne <iuem 

bc..se sent 1mA;ort:.nt co::mknd messages to " t.t-ak ro1·ce 

and e.st.iaul t unit&>. Strong evidence t.na t &. .t-Ouerful 

force is et:llyiLE; forU:l. Trt:fl"ic enelysis st1uws th.et 

the tt.sk force is east of l.uzon. Patro.l p1l:.nts kr.i.d 

aubs in the Pbilipl-'ine arc:! e:.re eending 11.essni;es 

reporting the aig11ting of J&.p units in tne South 

China See., to American air units in Chine.,, the 7th 

Fleet, and ~ air bases in the Philip~ine area. 

Snn Frlillcisco ii: sending mesi.;agcs to a tssk fcrce and 

units operating in the northeastern Pacific. 

(17) Type& oJ: .,lues b11sed on Luzon n·e icie:n tifie:d throuch 

intercept ot tneir call ei'1J.S• 

(18) 

' ( 

\ 
_. ......... -----------------~~~ REF ID:A72343 

---. 

(19) The t~ak torce in the Iwo JimL ~re~ bes been receiving 

weather reports Uid intelli~em:e mess&ges from the 

Leyte We~ther bureetu end the Taclobun ~ir be:Je. 

(~O) Intercept of' San Frcncisco bro.'.j,dce.st en 19 Fnbrlltl.ry 

gives Je.ve infor111.t tion th. t Vice Acim.irf-1 Turner is 

C.O. or the opere..tiont..J. units at Iwo Jima, aua th~t 

the lu1dillg forces a.:insist or the 4th &i1e:.rine Divieion froi:i Snipan, vnd the 5th Merine l>i vision from. 

the llar~i"i.e.lls, all under the cOJllI!!.e.n-:\ of Lt. Hener6l 

Hollaid Sid. tb.. 

(a) Japs inte:::-cepted m&n;y }-'lain text mese11tges sent by the 

Marines v. t Ir.o Jbm • They sus,rect tlu.~ t the ueesc ges 

are both real. and dummies. 

(22) Patrol pl.anee rrom the Phili...,r-inc. aret are v~.trolling 

the Inda-China coast. JRps conclude that, ti ken together with t. be sending or ilaforti:nt liaison 110• 

aessages on ~2 February by the CO of the Fu Fastern 

Air Force at lur:ming to the Supreme CO of t.tu· .AAF in 

China and to the CO or the P&cific Submarine Forces~ 

the. t the J &...,..~eEe muet ue on gu.erd agninst O! era. tions 

by plt.nc s s.nd subs in t.m· t area • 

(~J) Patrol planes in the Philipj.>ille tre: sent. out. aessages 

re~arting the signting of J~penese vessels ~jong tu.e 

Fi·eneh lndo-China coest and in the 'liainity cf' IlPimm 

Ialmd. 

(;:4) Chief of Sttiff e:.t 11.n.yhbusne Unit E:.t Nt.nid.nt; 1ants 10 

J apt.nese of J.merican birth immedie tely •in .ir. tercept 

1wrelef1F releting to enemy Americ&.11 tlr-"lt:nes. • 

('5) On 7 Deceo.bcr 1944, "n American .b-.24 1:1.!Jrroi:.c.t:ed Horth 

Chishit:!a (Uortner.a K:urilE:s) t-nd rf.ldioed thE t •bechu:.:e 

or engine trouble we :<re going to retropavlovsk• 

(Khmc.hetski penin~ul~). The p.lane then went to the 

northeast. Apin it radioed in alet.r thr·t it h!-.d 

found e:.n airfield bilC. was l!.nding. t cur tin:.&s 1 t. 

repeii.ted the sti:.tei:i.e:u1. tl&E:.t il. w1: s going to retroi>avlovsk. 

c. Conc:i..w::ions: 

Following is a summi-r,y of ;_Jiied circuits being intercepted, 

and Je..,~ese org&.nizations o:::.ri',ying on tne interce.rt work. 

·----------------------
REF ID:A72343 

l~? ~RJ[~H .ll.LITD CL.Cul'fS BEUG liliTERCE.P!ED 

Ad!lini1n.r .. tive - (.Ref #~ 11,U,2~) 

1-Supreme COJD:l~noier of Heit8llch1ku 

Sniraibu circuit at Honolulu ~.nd 

at luluk. 2-Centr~l H~ ~t Guam. 

J-CO ot Far !a11t.ern J.ir Force 

4-CO or Pacific Sul:a!a"ine Forces 

J.rfj.Y ~ir Force Clrcuitb. - (Ref. He, 

10, lJ, 14, 15, 17, 18, ~~. 16, 23, 

24, ~5, 19, 12, 10.) 

1-!lr bl!ees. 

2-R/! by pl.s.nea • 

Shie circuits. - (net. i4, 7} 

1-Shivi:; stE,t.ions 

2-Lend stations 

Sul:m.;rine circuits. - (ltet. ¥16) 

1-Su'bmerino Btt' tions 

jAYte ~anther Dureau. - (Ref. :'719) 

Ta,11Jc Force~ and J. sea ult Uni t.s oc low 

Divisiap. - (R~r. #ll, :1) 

1-In Marie.nP.s ~re~ 

2-01! Iwo JitlF 

lews broe.de::-st~ from "foreign att.t.ions. 

( rtef • !f;:., 9' 20 • ) 

1-San Fran:1ecc 

2-Genera.l 

8 ellaneous stations bein• interce •ted. 

C; rclli t undetermined. (N:f'. ,f'J, 5.) 

1-!ionolulu 

2-Port Moresb; 1 Tr;roline 1 F insc~1&fcr., 

llllne Bay. 

JAPJJIESE U!IITS lliTl!J\<l!.PrIHG 

P.E=ngoon 

.D!'.nkow &.ud C. nton ~·;;:eciol 

Intel1. liurcau. Haye~uRna 

Unit et Ni.nkingJ .Bt-tEvii1; 

Pinrf,Dg. 

Saigon 

Se.pporo 

? 

? 

? 

? 

Northern .1iroshim'1 Tusshincho 

Am.er1cv.n In Lelligeuce. {Sapporo'l) 

Se.pj.iOro 

Re.be.ul 

Tt1e purpose or thi~ st.Ul..ij is to dcteraine at what levels Allied 

oomr:unications are being intcrcept~dt P.nd ~net lcvsls of J~pEnese units 

at'e working on the intercepted mnterisl.