'E:P 3,3(h)(2) 

F'E:S6~36/50 USC 3605 

Cbairman., 

United \.Stat.•• C~catiCti• Intelllgel1ce Boardo 

London 

10th December, 1951 

LSIB/241+/Sl 

With reference to J°OUr memo~ UC CXXJ22'l dated ~d June 

19511 the LoQdon Signal< Int•lUgence Board notee that the ~ted States 

COllllUDicat:loae Intelligenr::e. Board bae a l"OTed the report of the 

2~ Jn par&·. gr&. ph '.)~k) :£ th. ~::t•renc• re:rt i+ ¥9,~00cl·. uded 

that ar,,. approach to the. '-- ~- ·· ... _ _should be 

deterred pencling consideration of the r<tport of the Tripartite Group" 

approach to them \&bout\ their cC1111Nnication security" 

3" L .. S.,IoB" proposes that that ~bould be briefed according to the document attached aa Appendix 1A1 and.that 

1 

the a~ should. b• ""4\\ at the tirot :rtwl~~: ~.s I.e. al8o 

make• lirit awroacn, to De iollOiffid a aays ter f&i' tnat ot 

the UoSo Ambaasadoro 

4, LoSQI"B. further proposes that the UoS .. C.l,Bo anciL.S11laBo 

1 

llCI01nHa 11110 according to par6'\~ SS of the Conference ~~l 

l~~~i~::~tj:~~~.:~~ So U .. K" authorities can pronde,\ in two months tim.t:i, 8 CCH 

•cbin•a to be offered to the I I.,. 

6., LoSoloBc would welcome UoSoC .. "to)no 9a COlll!lellte on these 

proposal.a at ite earlleet convenience" 

/a/I ...._Chi_iriDiii ___ _. 

London Signal Intelligence Board 

Incloeure vi.th t.JSCIB 23/l+'J dated '27 Decsaber 19510 

FORM 7Bl-ll 3S 

6 JUL 51 TOP SECRET SUEDE 
~o 3.3(h)(2) I/ / ~L 86-36/50 USC 3605 LSIB 244 51 

I 

Appendix 1A• 

)o \.\\ ~ \\ 1=-~:~pkit=.:: ~~i=• to RUiiil on we~ ;an ;ea,~ a•1J 

ll&J' w.tll be her mst prolifid 1 most epeedy and most reliable source of all" 

Thq regard it a• imperative that Ru••ia ehoul.d be depriYed or this source., 

Dot Ohl1' \llO that she wUl be denied the intelligence now accessible to her ~rem it, but. alao ao that o.tt1c1alo ot th• UoSo and UoKo Govenmenta 

-r more tree1r discu11 Tort·· ... ant matters ot common coneern with officials 

(! Go-vvnaente ban thertore decided to inetroct 

(a) undertake an energetic program• tor reorganisation or its 

CJpher Serrice and appropriate repl.a.ceiment ot its present 

878tema and practic••J 

(b) aoeept witbwt qualiticaticn and promulgate! I 

(c) 

eeaent1al ·~dards or secvity in each phase and aspect or 

t.h• program•; 

acoept ciireetl I participation in executing the 

programme, incllidiili participation on a working level qy 

represriatives qualified in the field ot general 

seourit;r aa well ae all aspects or CCllllWDication sec:\Jrit;ro 

FORM 781· t 135 

6 JUL 51 
TC~ SE~:q;:~i1=0-tfl4'DE 

lSJ.B/244/51 J~f;0:?.3(h)(2) 

!Pl 86.::36/50 USC 3605 Appendix 'A 1 

7,, Itl lie willing to aeo"Pt. these \proposals, the U.,So 

and UDlo GoYeI'Ull«it.8 are for their part. wilJ.ing to \provide aa. a lllinim.um.9 

on loag-tera/loan~sutf1c1ent Caabined C~ Machine:.\(CCM) to equip 

about 30 ot the JBOst important diplomatic• pQet,a with tw• machines oachbl 

a quart.er.to a.third of them at. once and the remainder\phaaod. in cooaonance 

wit.b BA'l'O nq,uirement10 (Thie machine bas) al.ree.d7 been accepted b;y the 

I !Qonrruuot tor For those poet• 

whieb cann'3t ilaaed.1ate1¥ be equi:pped with CCM~cbines,. ~<i as a 

etandb,r tor thoee Wich can, the! • ·.I GoTernment.s propoae\.one-t.1me ~d are prepared to &drlse on and aes1et; · •. in their ccnatruct.icno D 

L_ __ Jcan be assured that,, a.a the I • lllO\\ld be produeing\their own eettingaa 

tor t.he c,per Machines and {'i.r own ono..&imo pads, their t·.e·· .. le··· ... gr&ml vwld not. be readable by th _ • laovemmenta., 

80 The~ l in r-1 should be\. aware that· .. 

two of the prob ems which thili GOVeriiiiier1 • ~ad to face \in\arr1Ying 

at these cooclueione h&Ye boen 

FORM 781 l ns 6 JUL 51 

(a) 

(b) 

course o 

/report 

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VORM 781 lllS 

6 JUL 51 

E03.:3(h)(2) 

PL 86-36/50 USC 3605 

TOP SECRET SUEDE 

Appendix 1 At