Ai: 

·- ~-· -

-. .1'6 P.ruS..&tH~f T. 

BliIEFIRG SJS:i.'l' FOR THE Clwm.tAN,. JO~ CllDft OF Sf.API 

JOII:l.r CHIEFS or STAFF MEl!."'Tnn. 2430, MONDAY . 

22 JAmJAU' 1951 

' A~lD~· ITl!U ImIJDEll 3 

J.c.s. 2fll4/'I 

SUBJECT: REPORTS OF THE Ul/US COLL1JUICATICll SECtRITI CO?D'.EllENCE 

· 1. ·The J.c.s. 2C1/l+ aeries ~a the. tallmd.ng background: 

· . I.• The Bri.tiah Chiefs of statt prop0aed that there be a cc:.mplete int~ 

change o;r-CJ7P1iogra.pb1c pr1ncipl.es and poliq on a :recipl'CIC&l. basi8 .tn O!'der to . · 

solve the prob~ of the :replacemnt ot the c~ Cipher Lachlna, as well aa 

other comb1nGd cOmmmlcation aecuriv problems. 

S. The u.s. C.hiefli of st.aft intmmed the British Chiefs rd st.aft tbat 

t.hGy •re unable to accept the proposal far tull exchaJJge of· intormaticn but :recanr.aended exchange of c:qptographic intonnation in specific cateeoriaa. A 7-rota&-

cipher machine under developmmlt 1n the u. s. wae. pl'Oposed tar poeaible futUN use 

as· a Combined Cipher Dachineo · 

CIJHHEN'.l' REPORT1. ~~ r ~ ---~ {., ~ . .0 . 

2o In ccmterenceak 1zi l'laahin8ton, oClll'IADCing 21 Septaembar 19.501 u.K.· alld 

U. s. representatives aireed that 017Ptograph1c princ1plea ot the ?-rot.or cipher 

machl.ne be ac:lopted aa;...a.~ tor the p&'988Dt. Combined Ci.Jim' Uachine. other ornto~o. systems Within the categories agreed on 1'191'9 demonstrated.. 8Dl cliacuaaedo 

. . 

3. The Cha.1rmsn ot the u.s. amt u.K. Delegatic:ma 3ointll' reommm4 to the u.s. 

Chi.eta ot $atf and the Briti.Bh Chief's of staff that: · 

· &- Jinmed1ate11' and on a cont1nu1118 baa1s, there be a complete interchange 

~ ot teclm!C&l detdJ.s ot the crwtographic 878tams cliacusaecl :1n this CODtennca and 

s; .. ,.,.; .. · t-a- , that technical viat.:t;a to ac~ompllsh this be arranged., 

.~ ~ \i ·~"··· Ile ~ere be annual cant~ce·s en these sub3ecta tor the neit tour 1981"• • .... ·' · to .be .held .alMlrm~ in Landan and tvashlngtcn, and that the 1'11'8' ot these take 

place in London apprad.m.tel, nine mmth8 aft.er this cmterence {Jul1'.1951). 

...... 

. ' 

s.o The u .. s.-u.K. JCEC (Joint Commmicationa-KJ.ectran1.cs Colllilittee) cansid• and resolw• as ·a mat\e:r ot urgQnCT the canbined operati~ ·:requirements in 

the t1e1ds ~d b,- .the ccaterenoe • 

.!lo InterChange of intqrma.tion 0n other items of ccnbined :Interest. such 

aa securit,y aspects ot rn • autheat1cat1cm aysteme,. and ktt'-t&P8 generators be 

discussed at tut.ure ccmterencea, and that canb!ned requ1romanl;s tor g8neral 

point-to-point an-line encJ"IPtiaD be diacuaaed at the next aonfermceo· 

4o In the proceaa Ot coorcl1nating the Reports with the Armed Fo:roes Secu.ritw 

Ase1'1C1' CouncU and the Joint Com•mlcat:l.ou-EJ.eatzrcmlcs Commlttee, it was brought o• 

that the contenes had ~ to diacloaure of -the 7-~ ciphe!' maoMna to the British . Como.rmealtho . The Director, Armed Forces Security Agmq • has recaraendad. that diacl.oeme• 1d.thaat pr.I.or agNement, be lJJd.ted to the United Kingdom., Canada• Autralia, 

and mcnr ·r.al.and 1n accordance mth cur:rent poli.ciets of thl St.ate-Deteml8 utl1t&17 In- · 

tormaticn CODtra1. Committee and. ot the Joint Chiefs of staff (J.c.s. 9%1/89). · :reccmnndatJ.cm t'°uld lade diaOlosl.11'8 of- tbs new cmb.1.n.ed her mach1De tO 

on e:qre ~um 

contained :la ]gicJ.oaure ncn ot J.c.s. 2J114/1. 

5 •. Die Mtiab Chiefs of ~ haft 1nd1oat.ecl acce~ of the subject report.a 

_(J.c,s. 2rrt4/8)o . . . . EO 3.3(h)(2) . . 

§91.'i§ffJM.TIOJl; . ·PL 86-36/50. USC 3605 

6. It :la reac.....s.ect that the jaint NC*Ml"i9Adat1a'w ot the Cbalrmm ot the amferaea be apPl'Gnd. aubjec\ to the J.1m1tau.cma daacr.lbed. in paragraph 4 above. 

DIS'l'RIBU'l'ICB& 

09m:ral. BradJ.81' (3) Searst&17- JCS (4) Se~ta17, JCBO (4) I 

eclassified and 

pproved for release by 

SA on 05-20-2014 

ursuantto E.O. 13526 

~~~.~ .BABL B. B'10IB . leR Adml1'811 u.s. lilV 

Dlrecrtal'~ Anal FOl'C8a Secur1t7 Agmo.r 

1·9p SE·CRET