~ REF ID:A67307 I ~P GEGRET.l fi~B &NLY 

3 Jul7 1950 

Subject: U.S.-::British Interchange of Cr7,Ptographic Principles on 

a llec1procal :Basis. 

1. The f ollo11ii:ag peraoJlii.el met on 30 June 1950 to recommend 

t1Pes of equipment and developnents to be discussed with the U.X:. 

representatives: 

Colonel Collins 

Captain Sattord 

Mr. Jriecbnan 

Dr. Sink:ov 

Captain Shepard 

Dr. l'ullback 

.cm lnclerlin (tor Item a onl7) 

2. It was reaommended tt.at the f'ollowi:ag equipments be discussed 

under each at the categories listed below: 

eclassified and 

pproved for release by 

SA on 05-13-2014 

ursuantto E.O. 13526 

a. Special purpose teleprinter s7stema for the excha:age of 

intell:lcence material. 

ASAM B--l 'b Y:.. ............. .,.. ___ _, 

JW 

r a 

b. i('i.ov echelon (minor var veaaels) telegraphic s7st••· 

j,1 

c. ~Merchant ship telegraphic s;rstema. 

EO 3.3(h)(2) 

PCM PL 86:-36/50 USC 3605 

*DSJM:i.1 

:

M 

&per iiid poncll lll'lltEOI 

Str.:1p s7stema 

d. Meteorological aecurit7 s7atema including facsimile, teleprinter and telegraph. 
• 

.. 

e. Voice &ecurit7 &1'8tema for tactical purposes. 

Y-9 

Y-4 

!u&er low-echelon cipho~ a7stem 

*~ea item 

ge 

u 

3. It 1a recommended that the above l1at an4 agenda or equip--

ment to be discussed be submitted to .AFSAC and at that time aalc 

that two representatives from each Service be deaigJl&ted to attend 

the conference. 

2 lDClB 

1. Memo to 00.A. from 14 dated 

22 June, subjec'!i as above. 

2. Briel descr1pt1on ot eq'ijipmenta 

~ S. P. COLLllS 

Colonel, Sigaal. Corpe 

Deput;v Director, .AFSA 
SD.VIOi 

(A) 

(A) 

(A) 

(A) 

(lf) 

(A) 

(I) 

(Ji) 

(I') 

(A) 

(A) 

(B) 

SROB.T TIIJll.! 

, ________ _ 

.AJWI 7 

AS.AX 2 

CSP 3800.A. 

MOM 

...._____ -, --· 

PCM 

~--

!-9 

!-4 

KIL Olfas 

DllSClUPTIOlT 

TeletJP& cipher device used with l31B2 subset 

table. Modified Arm7 A~l or lfaVJ" CSP..1500. 

Converter lfX,-507()/u. Low echelon, electromechanical ott-llne cipher equipment. 

General purpose telat7,Pe cipher machine. 

l'ul.17 synchronous teletJPe cipher machine tor 

aircraft movement 171tem. 

Teletne cipher equipment, off line. 

Jacsimile securit7 equipment for enciphering 

weather ape. 

Modlti ed CSP-3800 to provide enclpherment of 

d:lglta tor weather traffic. - -

Mechanical Cipher Machine for low echelon llteral 

requirements • 

Portable Oipher Machine for low echelon uae where 

electrioal power la a'VB.llable. 

Staff level clphoJl1' a7stem to provlde apeeoh 

aaaur:lt7 over short o:lrcuita aervi:ac various Staff 

OomaDds. 

Low echelon speech security 178tem. 

Jacaimlle 1ecurit7 equipment for the enc:lpherment 

of weather maps. 

• 
_ ~---• • REF ID:A67307 .• 

«· ,. Office Mem~randum • UNITED ·sTATEs GOVERNMENT 

TO ~ (;Q 

OS- UI( 
-ME'MO ROU I NAME OR TITLE 

Col. Cellins ORGANIZATION AND LOCATION 

OOA 

2 

3 

REMARKS 

INITIALS 

DATE 

CIRCULATE 

COORDINATION 

FILE 

INF'ORMAJlON 

NECESSARY ACTION 

NOTE AND RETURN 

SEE ME 

SIGNATURE 

1. Herewith draft agenda you requested in your 

memo of 14 June 1950. 

2. I have made no recommendations as to the 

specif'ic machines, devices, or systems to be disclosed, 

because I feel that that should be the first job.of 

the U.S. representatives to decide on in their preconference meetings• I suggest that the U.S. 

representatives be nomina.ted·as per par. 4 of my covering memo, that they be directed to e:Xamine the draft 

agenda, make any recommendations for addition or 

deletiens 'tlierein, ahd that they then subm4:,t for 7our 

approval a list of .specific .u.s~ machines, devices,· 

systems, pr:tnciples, .and/or components ·to be disclosed 

and discussed in BR~us eoEferences.'· "Tbat list need ~ accompa:o.y o1il' pi~eposed Agenda when the. latter is 

forwarded tG the· Bi'i.tish. · ). I presi:i.me tl:iat U .s. representatives will -. include personnel from --.AFSA, from t-he· 'three Service 

Cryptologic Organizations, and from the Army (Signal . . .. 

( o1?'er) 

FROM NAME OR TITI.E · W. F. ~EJune 50 

ORGANIZATlnN AND LOCATION 

NME FORM NO 95 . 10~~ 1 
.~E;-7B: ~73tV7 '- ~: .... - ·- ·--~ .... ..,,.._ ..... 

Corps)' the Na,,Y (Iiaval Communications) and 

the Air Force (Air Communications). In the 

case of item la of the Agenda, AFSA representa- . t'ives must include people who can present the : 

···interests of ·uSA-02 a·nd -AFSA-13. ·rn the case 

of item J.S~ it· is:po~sible that.there may have . to· be people ·who; cah present the interests of 

··the meteorological agencies of. the· Service·s, · 

but· this can be ascert.ained lllter. · 4~ : :AFSA-14 will· be glad to coordinate·· the 

preparation of recommendlt.tions for nominat·ions 

····or:u.s. represeiitatiyes. 

.··· ,· 

• .. . ,. . · .... 

..·.·· 

• 

. ... •.· ·.·.' 

±Ob -.c: e, _, "'9'~ • , .. r. . - . ~.,. 

'':.,111 • 
- • , ,, . 

YEMORANDUDI 22 June 1950 

TO: AFSA-00.A 

FROM: AFSA-14 

Subject: u.s.-Britiah Interchange o:t Cryptographic Principles OD 

a Reciprocal Basia 

Reterence: OOA Memo to AFSA-14 dated l4 June 1950 

1. Attached is a tentative agenda for the subject conference 

as requested by' reference. 

2. It completeq tree discussion on the part ot the u.s. conferees 

is permitted on the five subjects, the deliberations o:t the conference 

will almost certainl;y spread to virtualq all U.S. cryptographic 

principles and equipments now under development or in the idea stage 

at AFSA. For example, a complete discussion on the first item, special 

purpose teleprinter systems for the exchange of intelligence material, 

might wll involve the ASAM-9 and the ASAM-ls. The second it•, minor 

war vessels systems, might imrolve a discussion of the PCM and the 

ASAM-7. If the ASAM-7, 9 or 15 are discussed, than the )6-point rotor 

and the re-ant1'1' principle have to be disclosed. .Another example is in 

the case ot ciphoDT equipment. Our knowledge on cipho!IT ayst•s for 

tactical use comes in a large part from higher level developments which 

are not on the agenda. In short, if this is to be a limited conference, 

as intended b)" the U .s., then the limitations must be clearly detined. 

The onq possible or practicable "81' to do this would be to require 

the U.S. conferees to confine their discussion& to specil'ic equipments, 

without going into or giving background reasoning it the latter involves 

ideas not to be disclosed. The specific equipments and ideas to be disclosed and those to be withheld must be clea.rq set forth prior to the 

conference. 

3. From a purely technical viewpoint, ot course, a very strictly 

limited conf'erence is much lass satistacto17 than a completeq unlimited 

one. A more serious consideration, it the conference is to be verylimited, is that the u.s. mq be put into an embarrassing position at 

a later date if the British should adopt soma ot the U.S. developments 

disclosed at this conference, while the U.S. subsequentll' chooses to 

adopt equipments withheld. For this reason, it would be advisable to 

inform the British that the U.S. is not committing itself' to utilize 

&JV' of the equipments now under development which are being disclosed. 
.... 

• " . . e REF ID:A67307 • 

l'OP @EC!R~if m. ~ms IU 

Memorandum to .AFSA-OOA. (continued) 

4. In view ot the comments -.de above, it is suggested that 

the U.S. representatives to this proposed conference should be 

nominated at an early date and meetings ot these representatives 

should be held prior to submission of the agenda to the British and 

certainq prior to the first meeting. The purpose of these meetings 

of pureq U.S. representatives would be to clarity the situation by 

establishing and defining the limitations on discussions with the 

British in the Combined Conference. 

5. It is suggested further that the conference be organized 

in sub-comitteee, one for each ot the five items on the agenda, and 

an executive committee with a procedure similar to previous BRD'SA 

technical conferences. 

6. .AFSA-0), 04, and 12 are in essential agreement with the 

above and with the proposed agenda. 

<lt);pJ._·_ ~4,_..__ ~.FR Chief, Technical Division 

Incl 

Tentative agenda 

'TGP SEGRE,= ~e ~Q MS RY 

2 
REF ID:A67307 

TOP s EGR ETu. s. ms ., 

Agenda for V .8. -Br1,18h Ccm.teraoe 

on the llzcbange of Oz7pto81'8ph10 Rl'1no1ples 

Referenc.e1 •mol'U4ml tztam OOA. dated lJt. June 1950 

~~ 

1. !he -subject conterenoe 1• to be an 1n1t1&1 aplora- to17 ocmterenoe to uobaDge 1Dtomat1an bJ 41•oloaure of 

aodels ... designs ot onvtoP"lb1o equ1p11l81lt nov under 

48Yelopm.cmt 1D. tba tollOV1DS oa egories 1 

a. 8peo1&l purpose telepriD.ter a7stma tor the 

acba.Dge ot 1D.tell1senae •teri&l. 

b. Lav echelcm. (minor var veaaela) telegraphic 

a7atma. 

c. •erobant ship te1e'9ph10 a7atema. 

4. lleteorologioal mouritJ a7atma 1nclw'1ng taca1m1le, teleprinter &D4 telesz-ph. 

e. Voice aecur1t7 •J•t•• tor tactical purpoaea. 

2. It 1• augeated tbat ea.oh ot theae tnea of a7at•• 

be diacuaaed accol'd.1.ng to a pattem. auah aa tbat outlined 1n 

enoloaure A • 

. 

.' .. 

- --- --....---- ...... ""' -
-.~ I 

REF ID:A67307 

U.S. EYB •Y 

1. Ob3•ottve 

2 • !Jpe or level ot :DlplOJD1811t .-., . 

B. 0p81'&t1ona1 Cba~oter11t1ca 

1, SeouritT 

a, CZ'J'P't088CUl'itJ' 

b, Rad1a.t1on 8ecur1t7 

c, 

2, :rmiot1ona1 Requ1rm.ent• 

'· Radio Interterence 

4, rover Requirement• 

5. Special Bequ1ramenta 

c. Pb.Jaical Cbara.oteri•t1c• 

1. Weight and Volume :ractor• 

2. Opeat1on, ~l'Bmlportat1cm., 

Btozia.se Requ1rement• Packaging and 

'· Deatrwstion llequirment• 

J>. Opeat1cm. an4 Jl&1ntenance Cbar&oter1at1c• ot 

llQuipaent 

JI. 0-1 nt ..Imp11oa t10Dll Yi th lleapeot to Ccmaequanoes ' ot O&satve ~ llqu1paent 

II, rreaat Bq1rl.pwen.t - u .a. 

A. »momtra,1cm or J>eeonpticm .. 

i 

B. l>1aobll•1an oOllOend.Dg Adequao7 Aooor41Dg to I 

· (XDtel'1a, :Lcms-l'BDS•1 Blae:l'pllGJ") • ....... ' I • 

.: .· ·:.:_TOP S._ECRE~ 1._-_l DES_, 

;r l"I I .: 11 _. I 

--- -~-- -- - - ~.J J .. - _..i,.!'.)...11- _,;.:wm!,....:c._ ---
-.. - REF ID:A67307 • 

Enclosure A (oontinued) 

III. Present EqulpJ!lent - U .K. 

A. Dosc.r:-'lpt.lon or Modal Demonstration 

B. Dlscuoslon conce:t'!l1ns Adequacy According to I. 

'!V. Equipment under Developnent - U.S. 

A. Description or Model Demonstration 

B. Adequacy o.ccord:i.D.r; to I 

O. Present Stat"!.ls 

D. Plans 

V. Equlpmont unde:::- Develo:?l!lont - U .K. 

A. Description oz- Modol Dom'l?lstra.t1on 

B. Adeque.01 a.cco:rdlnc to I 

c. Present Status 

D. Plans