- -----· 

HP BRil--

JISA-<Xlt/dJc 

leliall() 0015 9 

mr amm 2 8 JUN 1951 

Dk>RABDUK 10B1 Ml'. 8l1d.n A. SpealaaD1 BDcuti w DI.Met.or, Camait\ee 

CID BJ..ctronlca, &DB 

IUBJS:Tc Ill BCAG Conterence 

1. The aalosuree 11'• tarwarded tor 70u:r inf'oraU.on. I hope \hat 7011 will b• able to at.tend. all ..Unga of tbi• acateND:e. 1.n 

thi• cC11Deoticn, •• tar •• APSA 11 eoncerned, w would like hmoetonh 

to CQ.laider 7011 a •mber ot sc.&o, a-ottlolo. 

I. Bloloeure 2, which 1• a.traoted traa lboloaun 1 and claallltiecl SECU'l, can be aent to SCAG IUlllbel"• in a.tmdlna the tomal Bl>B 

lnY1tat1on. I ccloee co;pi•• tor tbU JIUl"PO•• 

J. a. ?011 will note t.bat. w haw llCbedulecl t.wo preatnta\1oae 

1v' 80.AO mmber•t 

(l) _. ill". D9ecb,. who ill 1aeat. qualified to d11Cwse item 

J.a of the .ApGda, u tar•• ocmceme \b9 lav;r aachlnl. 

. (2) BT Mr.-. Hon.rd, wbo 1• best. quallft.ed. 'to d18oaae 

ita Sk· 

to making ~. th•• I u. pr.1entat1an• 

e!t.t.ng to th••• 

aDd to 

member• 

gift thm 

to reqm.t. 

tiJI• to 

their 

prepare ~ tor 

them. 

4. n... declull(r tJd.• ~udwn n.n mcl.osur .. are r.owd. 

Jticlo.ur•• - J 

l.e Aced& for at SCAB 

Contnace (1 COJ'T) 

a. J:atran .fl'Oll ApncSa 

tor 14 IOAG Cont•t111c• (ll copiea) 

J• ArSA.-oor IDPO cltcl 

as Jun s1 (1 co.w) 

_L_,.,. 

EARL E. S!OHI 

Bear Admiral. u.s. l'aq Direoto~, Armed Forces SeourityAgenoy 

W.F.Friedma:n/et/'Zl Jun 51 

AFSA-OOT/ext 60240 

E.s.L.Goodwin/meb/27 Jun 51 

AFSA-11/60235 

RA.DK Farl E Stone/dk/27 Jun 51 

AFSA-00, Ext 60528 

eclassified and approved for release by NSA on 09-11-2014 

ursuantto E.O. 13526 
lOP Blil.~ ... 28 JUN 1951 

llWAIDUM 1'<1!1 11r. !d\'dn A. -..11nan, IDCutlw Dbector. Camd.tt.ee 

• !lAct.roD1••1 IDB 

1. tbe llll0lo1U1"ta al'e tarmrded ts 1'0'fll1 w...at.t.on. I lq19 

u.t. JOU 1d.U be Ula te attend all ...U.aa• •t w. OGDtenw:e. In 

W.. ccmneoU.crla u hr •• !rs& i• eoacll'ned. w -..14 11U ltmoetc;ll'\h '9 CCl'laidei" 1Clll a ..... of !CAO,. a-olfiot.. 

a. ._loaqre 2, wld.eh 1a utra.cted f1'Ca laoloRN 1 amt elaeatfte4 UCR£f, ean ti. ..n\ to ICAG Mllbera iA at.tndlng tbe ....i ID.I 

llrvlt.t.im. I .oloee ~· to~ 'tJd.lt JllJ"PO•• 

J, •• Dna w11l note t.bat. " IW.w 11Cb9dultd '1ro pl'811ent.at.1om .,. SCAG....,_.a1 

(1) fir Ila". ~ who i1 llen qu1Ui9d to dillnls1 ita 

II of the A&a1&1 • fU' u ~ Ult ln7 uc!dne. 

(2) a, Ill'. '-N1 1lho 1m bl.t CIJ•Ut.led to .U.Om• 1w.51. 

to mattna ~ the• 

l • 

..-•nta'Uons 

wr1tSll£ to t.heae 

IAd -to 

llfllb9ra 

&1• the 

to nqmst 

u.. ~ 

their 

pnpare 

~ 

- tai.. 

4. PlaM cleol••.U:V ~· ~ wt-A celo•ur• an.,,..,..,. 

CC: AFSA-lll {3) 

-JIP'&Eal ,;; 

._ .. ~-" ... ~...._..... 

l.ARL Be SfOIB 

I.ea Admiral, u.s. :la'V7 

Dlreot.or, .Armed :roraes Seour1t7 .lseDOJ 

w.r.lriedm&n/et/27 .Jtm Sl 

A.FSA-ooT/ ext 60240 

1.s.L.Goodwin/meb/2'7 Jun 51 

AJ'SA-ll/60235 

· RAD){ Earl E stone/dk/'¥! Jun 51 

AFSA-00,, Ext 60528 

' •. \. 

\ 

' \ 

\ \ 

"· \ ' ' 

\ 
REF ID: A66070 -

-~ 1 CJF'·'seeREiT 

~•mmt 

A'l3A.-OO/va 

...S.al1000162 

2 8 JUN 195t 

MDOFiAIDIJM VO:-~ §~. llN<IUM DOUGU..SS1 ASSliTAIT DIM-CT<E 1 

~t.£11l' %JCT.bl.Ll'14.!Ei:. 1 CIA 

IU&JiC?1 Ace•• tor .'.;;ecewld C•t.r.aoe ot &CAC, 10 .Jul.J 19,1 

Copy tos (w/o incl) 

AFS.A.-OOB 

AFSA..oor !( *¥t -r:.2_ • -:::% 

This document oontaina 1ntormatioa 

atteoting the national detenae ot 

the United States within the meaning ot the Esp L .•!!1.we Laws. Title 18, 

u.s.o., Seotion~ 1~3 and 79'· iho 

transmission or .W~t 

~':P8fts$cwn unauthorized persctD 1• pi-olliblte4 

b7 law. 

B..AIJ( F.arl f-. Stone/wn/26.Jun.51 .APsA-oo, Ext 6os2s 
REF ID:A66070 

e ,~cs1·R1crEo 1 

AFSA<=OO/dlc 

23»q1951 

SUBJECT: SCAG CC>l'lterence .... 4c:-S June 19.51 

lo I plan to serve a simple buttet lunch on MONDAY, 4 June in 

1111' office (Room 19-ll.8) Gr AFSA Conference Room (R~ 19=125) for the 

SCAG members (about 7 peopl.e) plus the AFSA Deput;ieao 

2o I want to be sure each visitor is personallT attended. on ea.ch 

dq ... including luncheon on TUESDAY_, 5 June .... when I shall be otherwise 

engaaedo 

3o Please have AFSA<=OO.r arr.-mge so that a kq AFSA of'tice:r or 

ciir.llian is detailed to each visitor for thia purpose. ae appropriate .... 

and AFSA=OOT arrange with CO, NAVSECSTA so that good service is a'Vail= 

able to visitors at our cafeteria during lunch time on S June ... in the 

Executive 1li.ning Roamo 

. 4o JV eow or this memorandum- AFSA-""'16 ~11 make arrangements 

tor is~ appropriate badges to the viaitorao 

cow t.os 

co,, Na.vSeeSta 

Op=202 

AFSJ..:..-OOA. AFSJP02 

AFSAc=OOC AFSA..03 AF~ AFShal6 

EARL E. STONE 

Rear Admiral, U .so Nav.r 

Di:recto:r, Armed Forces Securiv AgeD.f:7 

RESTRICTED 

--------·--------------------
, 

/. 

I' 

.. ~ 

REF ID:A66070 • 

TOP SECRET 

.]) R. .A.FT 

SPECIAL CRYP'l'OLOOIC ADVISORY GROUP 

(SCAG) 

-

Age ma 

tor 

Secord Conterenc:e ot SCAG 

Opening on 

lO July 1951 

1 

l'OP SECRET 

- ·-··-····---
I 

' 

e REF ID:A66070. 

TOP SECRET 

Agenda for 10 Jul¥ 1951 

Time: 9:(() A.U. 

Place: Room 202, Building 20, l:Ja.val Security station, 3801 Neb1•aska 

Avenue, North l''est, Washington 

1. l'"elcorrd.ng remarks: 

Rea!· Admiral Earl E. Stone, USN, Director, AFSA; 

KE-. F.dwin A. Speakman, Executive Oirector, Committee on FJ.ectronics, 

RDBJ and 

A representative ot the Director of Central Intelligence 

2. outline of' program for this Conterence: 

Capt. J. S., Harper, USN, Chief, Office ot Research and Developnent, 

AFSA 

J. Presentations on cryptographic devices employing wired rotors: 

a. Review of Enigma machine: 

LCDR. A. Gleason, USNR 

b. Question am discussion period. 

c. The Combined Cipher ?.'kchine ( CC?I) : 

Mr. Frank Austin, /iFSA-41 

d. Question and discussjon period. 

* * * * Lut~CHEON 

{Executive dining rom., Naval Security station Cafeteria) 

* * * 

4.. Discussion ot logical design of certain cryptanal;ytic r.iachines used 

as aida 1n the solution of rotor ma.chines: 

ao 

b. 

c. 

d. 

e. 

Bombe - Dr. H. Campaigne 

Duenna - LCDR.. :u. Hall 

Scritcher - l~. A. Dunleyv:arlock - Dr. Jo F..a.chus 

Message setting - Dr. s. Kullbaek 

(During this period it is desired that each SCAG member indicate 

the specific segment or the field of special interest to him1 

what additional information or briefing he deairea; 1."lhat he 

wishes to concen'trate on, etc.) . 

2 

TAP '1FC~FT 
/ ... ~· J 

• REF ID:A66070. 

TOP SECRET 

11 July 1951 

Time: 9:00 AD~: .. 

Place: Roan 0200, Building 11B", Arlington Hall Station. 

5. Discussion of engineering design am problems in the constructior,· and 

functioning ot certain cryptanalytic machines used as cry-p~ic 

6. 

aids in solution ot rotor ma.chines: · 

ao Bambe {a-. L. Rosen - Arm:! type 

{Ur. J" Desch - llav type 

b. Duenna - l'r. J. Howard 

c. Scritcher ?Er. Ro BO\"mlSD 

d. \'7arloek II Dr. J. Eachus 

e. lTessage setting - Mr. L. Rosen 

* * * * * 

LUNCHEON 

(Executive dining rocm, AHS Caf'eteria) 

* * * 

Seminar on electronic represent.ation or \d.red rotors: -

a. llatrix-hal.t Hebern - ur. Roger ?.:OW.ton 

b. URSA - Dr. J. Eachus 

c. Slide tube - ~- R. Sikes 

d. Shift, registers - ?.11:-. L. Rosern 

e. Delq line modifications - l!r. R. Bol\'IilaD 

7.. Secd.nar on knovm mathematical principles ot wired rotors: 

Dr. H. Campa.igne, with 

LCDR. ?.'. Hall 

I.CDR. A. Gleason 

Sessions art.er 11 Ju.17 1951: 

1.ndividual visits to working sections and dlscussions with technical 

personnel engaged in working on specific problems in the f'ield of 

interest. 

Final Session 

(To be decided later. At this session it ~dll be desirable to discuss 

with SCAG tneir recCll"llnendations for nominees tor additional membership.) 

TOP SECRET