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A;,JCU El.!?J!.SSY LOMDON 

l\!ILID WASHN DC 

De. te P::..leci._ .:!AY 22 1943 

'i:iHe :::?iled l04oz 

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-----:---1·~----- 'iilHE?I SAN TUll.It!G LAST Sl:.TURDAY Ai;]) TOLD h-:CM !.~ODIFICATIONS BEING 

INTRODUCED IN BUSCH DEVICE TO ELIMIUATE OBJECTIONABLE FE..\TURES 

HE EXPRESSED s;..TISF!:.CTIO'N BUT 0:9VIO\JSI.Y ~"iAS NOT ur POSITION TO 

3-IVE -~PPRCVAL IN ABS:!?lCE OF DRA. 'IU3S P:s!?T;.n~IMG· TO PROPOSE 

MODIFIC.alTIOt-;s PD FHIE:m!.AN TO CORD:i.DJ.ihl: SI,NED PE_:..!3oDY PD TURING 

-011 LEAVE T~IS 1

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2

,J!.il.<. BUT CAM P.R09ABLY SEE l:.-:C!F. ?."OUDAY OH TUESDAY ,. .. , .... 

AND Va!.L TRY '1ZT EXPRESSED OPil·iION FRO!.! HIV. PD HO':l:s:v"~ snrcE 

I DQ NOT ?:~YSELF K?lO"~i 'ilHnT !..fODIFICATIONS COMSIST OF Cl.IA +mW . HAVIMG ~ER.ELY 3BEli IN PRBLI?-!I?TARY Sl'A'JES ··~"EI; I L3FT \VAS..tfI?l~TON 

OMA J'J.1 NOT ABLE TO Il\1DICA.TE! SJ..':'rE TO Hii.f AUD ~:CE DOUBT rlHETSER 

HIS A:?ROVAL WOUGl BE OBTAINED UMTIL DE~AILS ARE HADE AVAII..A3IJ: 

I'N FOiU: OF DRb."~I1'l'lS OR D~CRIPT!Ol'l FREFEaA9LY SOTS PD ?I.EAS!i: 

ET"° 

ADVISE VIA 

• 

~IIB?. PETER DI:rt:iCT CP.Al~WEL WH."°T::VER. LA i:'l'E.~ ARE 

.,,. . ~I?lG SENT BL~. r: .- . 'i'. " Alt~ Ilt LOliDOU O?~LY FOR FE'."i HOTJRS TODAY 

. L.E'\SI 

AF.D RE'i'UR~IllG Oll 1.~0iID~Y ~O ST.AY THE..-::tE AT ~ Al:OTHER W'~5!' PD 

HAVE DrF..:ED IT J\.DVIS..t:.BLE 30 I?:l'l'O D!l'.!.IIS QF E..=..SY OPER.:.TIO::\ FaOLI - .. 

?CIN''!' v:r.z:: OF RECOR::> KE:=:?:::::I.:G C?.:A CHANKELIZilIG CF OPERATIO:ts 

~(. TILi.IliIHG !l~ETHODS A1"!D Li/1.TERli.LS ETC FD F'0:3.EJOI:tl HaS ~-\:<El{ 

FOUR 1iHOLE DJ..YS A!i.k-n WILL F..E'~UL~E A!30UT T'·\'Q I.!O~:S PD T:h'ER3 STII.L 

REMAIN V.Al\Y 0Tf13P 'l'l:""!N'JS I SEOUI.D SEE !..~ L::::J..ST Ili BRIEF otrTLINE 

, C'! "'i A•.l .,r 4251.._ 

D::. tc Cc:.::-:;leted ·- L~i..Y 24 1943 

Ti1uc Cc?:~leted 2035Z 

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Declassified and approved for release by NSA on 05-28-2014 pursuantto E.O. 1352a 

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A~·~~l~ E:.~a"".SSY LOIIDON 

!.~ IlID "·'lhSHlJ DC 

4649 

Date ?~.led_ '!ft,v 22 1943 

Til.~ Piled 1040Z 

Ah"D T~'"ESE ~Ill R~UIRE FOUR OR FIVE D~YS AT MINI~~ol PD A~ ~UCH 

IMPilESSED ·:iITH J..~!OUMT OF CEECKU;~ ;.~D DOUBLE CEEC:F:INQ ENFORCED 

IN E.~SY OPERATIONS TO INSU?..E TP~.T ~SSOI.UTELY NOTHI~G IS OVERBl.1.SIS FOR cnra IS HOT PASSED UP PD IND~E::::> I1iY D~PR:SSSIO?l IS 

VERY STRONJ TH;"~T THE SCIENCE PTJRSUED AT F~RK IS NOT CRYPTANALYSIS 

BUT CP..IBTOI.03Y OR CRI:9TO,P.AP!!Y CJtL A FIELD Ili \"JIIICH WE CAN 

I.i=!A.RN A GR.EhT DEJ..L FRm~ THE!'ii AND ~\"EICH ''FE NEED TO LE.AJ{Ii C?.~A 

llOT Ol~LY FOR ITS Q'.VN V;.LUE IN TH5 lEl'iERAL FI3ID BUT ALSO P.ARD 

la.ND WHAT IS MORE TO THE POillT PAREl~ SO TJL4.T "lE CAN APPLY THE 

FRUITS OF :9RITISn EXPERIENCE m; ~.SY ~o OUR "¥ORK ON JIG PD 

HAVE BEEN T/!..'ltI!i' J..!A.HY liOT3S AND WI!.I. a.itI~;G SA!.~E BACK FOR 

CAREFUL STUDY BUT NO DOUBT JOHMSON HAS AI.REP.DY TDLD YOU ~UCH 

?S. 

Atom; SAl!E LI~'"ES, P:f • .:-& Tl!ii&Z A:r.t DISA?POINTED NOT FIND TELEGRAl:S 

1 FR<>li~ YOU :JIVI!lG EV~i &ft.RE OUTlI?-lES Oli 'NP'.A T H.~PPENil:G T!mRE ON 

A,,,~ 'I\ w EASY DISCUSSION'S PD ;"iOULD BF. H~LPFUL TO U.E TO !UiO .• ¥ WHAT TO 

. C O!!CEN'i'RATE ATTE!\~IO!l Oll PD 'ET Ol~ir:Y HIN1

.:'.$ FRO!.: PEOP!.S AT PA!iK 

c)-~ND HA.VE FEELIU'J OF \""!ORKIUQ I~I DARK ERE PD PIEA.SE EXPEDITE 

' '\" . 

., ANS!l:E:RS TO ?.~ T:S:LEJR;.MS ASY.IN".:: ,,~;.RI us UrFOR:'A111 ! N DESIRED co1nraci:ro1~ • . WITE JJ!.C c ONPERENCE· Pl.:J. :-evR I~l '!'AL.T{I?fl ?i'ITS TILTMA.N YESTERDAY 

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REF ID:A72560 

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:::'C: IJ~E:.f3ASSY I.OlIDO!i 

1.:ILI::l :.tt.s::r1;~TON DC 

4849 

Ti1.le ?iled ··---------

HE L"1DICATED DESIR.kBILITY U.ORE CJ..P..:?"FUI. DR..:..FTillG OF ~!.EJR.U!S 

FRCW. ARLI~JTOI! O~'! TEC3NIC/i L HATTERS AS FI?i'DS THE!. SOMETI!.~ES 

09SCURE 03 Aif:3I'lUOUS AND NOT B:;:~i:.USE OF DIFFE!t~CES u; TE..'it?.!-

INOLOGY PD I StJ'G:JEST CAREFUL R3VIE"{l OF OUTGOING ::ESSA.'tES TO INSURE 

CLARITY PARA FIVE STILL 30IN3 STRONG FINDING T:iIN3S VASTLY 

IHTERESTI:'fG AlJ> HOPE Al:! A:9LE RETAIN Ll\..R·JE PART OF US3:FUL 

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