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UK/US 0~1-0.JNI.:]:~TIONS SEOlJB.I'fY COl·.J1'"1ti:t.ENOE 195). 

Minut~s 

of the Second Meeting of ~he 

__ .-l!:xecut i ve Cornmi tt_t::e • __ 

86-36/50 USC 3605 

ecretary 

u.s!... 

~fr. W.J!\ fi1riedman 

Mr. 1!1 • C. .t': .. uatin 

Mr. J .R. Chiles 

Mr. ~.R~ Chitt~nden 

Mr. D. Wolfond 

Lt.Col. F. Chilton, U.S. Army. 

0dr. J.C. Hargreaves, U.S.N. 

Lt.Col, b'. Marshall, U.S ... '_.1!1 • 

Itfinj. ~ .. ~.?YI. Ge·tchell, U •• s. .L"'r~r. 

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1. .i£.pproval of Minutes of Fira1!_ Meeting held on 26th October. 

The Executive q_<;>~~tte~ approved the Minutes as circulatad, subject to the 

insertion of "U.S • ..1.1.rmy" aftt:r the names of Lt.Col. P. Chilton and 

Major W.hl. Getchell in the list of those pres~nt and in Items 1(a) and (b). ~....... .... - ·' 

2. 'rhe JSxecutive Comm:!:.!ill examined the draft reports submitted by the 5ubCommitt0cs as listed below and com~ented as follows:-

(a) Security Sub-Committe~. 

(i) LCS/~~inal_l?r&ftl - :t'ftoduction .l±:quipments. .i.1.ppr9ved, 

subject to deletion of "the from nmeet the agreed UK/US 

criteria" in the Note after para. 7. 

(ii) IJJS/S/R2 {Final.P..!'aft) - Transmission Security. 

Referred book to the Security Sub-Com.mittee for revision and inclusion 

of statements on the following points:-

~. Introduction of more than one Call Sign Basic Book 

concurrt:intly. 

B. 

c. 

D. 

.i' ... bolition of plain languag~ traffic in peace end war time 

(except for certain tactical messages in forward are~.s 

e.g. between armoured vehicles) 

Greatly reduced value of individual security improvements 

if they are· adopt~d piecemeal or are not comprehensive. 

Proposals in· para.. 4 regarding disguise of system 

indicators to be amplified_. 

/E. 

SECRET. 

Declassified and approved for release by NSA on 05-27-2014 pursuantto E.O. 1352a ·-
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84 REF ID:A522935 

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E. 1'1requency chenging is most desirable in war time and 

there should be peace time training. Statement of which 

tYPes of link require this pr<;icedure. l•'requency chaneing 

also affords some defence against jemmirig.. --

1!1

• ..:..a.dition::.l pru-c.greph recommending monitorine. 

(iii) IJJS/S/_R3 61ina.l Draftl- On-Line 'feletYPewriter Cypher Systems. 

Minor changes and editorial amendments, to be included in a 

revised dra:f't. 

(iv) T.JJS/S/Rl+ (Final Draft) - Off-Line .l!.quipments.-

Teletypewriter equipment used off-lino - Special 

l<urpose equipment. 

Minor changes and editorial amendments, to be included in a 

revised draft. 

(v) IJJS/S/p.5 (Final D.!:,aft) - Speech and-Cifax e.quipments. 

To be revised; pore.graph 1 to contain on additional statement 

to the effect that "many equipments e.re in the development 

stage ond owing to imperfect knowledge of the subject, it is 

impossible to make firm security ~ssessments but the opinions 

formed so far justify developments being continued." 

(v) LCS(53)S/R6 (Final Drcft). - Security Criteria. 

Minor chenges and editorial. amendments, to be included in 

a revised draft. 

/.nnexes Band C to.b~ downgraded to SECRET i~ possible. 

(b) Engineering Sub-Committee. 

!£.S(53)/N/R1_ - Report - ?hase I. 

- The Executive Committee discussed this drnft at length o.nd 

decided upon a. num.bcr of amendments. ..·~ revised clraft will be 

submitted e.t the next meeting. 

The Executive Gommittee not~d that the ~ngineering Committee had 

also prepared a catalogu~. and charts of U.K. and U.S. equipments, 

in being or under development, for the guidance-of the delegates 

taking part in :i:'hase II • 

.3. Date of Next Meeting. Thursday, 5th November, at 2.30 p.m. 

cob ertnce 15ecretad. 

PL 86-36/50 USC 3605 

~IBUTION: 

EXECUTIVE COWUTT:b:E. 

SECRET. 

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