• 

CSGAS=70 

~~-224 • t, unr g !!J!h1f"'" ir m r 

lllP.Am'MBNr / Of TD ~ BEADQUAB'l'.ERS Am« SBcmu·rr .AOENCY 

'ffASllINGT()B 251 DD Co 

SllBC~ lW'Ciff BC. 2P 

~ i'OB DZ .ABM! SRCORI'ti Aa&NCY TICBNICAL C~ 

SubJe~: In1tiaticm ot D/A ProJect Boo 29-6G-030, NC.Jo. Mark II anc1 

Alphabetic Su'bmtitutioim Device 

tao lBS :from Chief', Machime Bmnch to Chief, Research and Development 

Division, dated 6 JenW1?'7 19'&-9, Sub~ect~ :NC..4 Nark II. 

· b. :ms frm1 Chief 0 Machim Branch to Chief', Research andDave lopnent 

DiTiBian, dated 17 JaDUal'1 1949, SubJect: Mil1tal7 Chara.cteristioe ot t'he BC-4 

!~k II and Alphabetical Substitution Device. 

a. ~iea Concermct: 

(1.) Ccpizant Ag.ency: 'ftav7 

(2) Dix:ectins .Asenc7: Na.,,-

(3) Regueetilllg .Agenc7: Al"lll1 SecuritJ Agenc1· and 1'1a'7 

(II) Particill8tine .Apnc7: . ~ SeCUll"it7 .Agency 

(') Co01"dingatin8 Asenc;r: · 1fa'Q 

{6) other Probable Interested .Agencies: USA.I' 

b. lJDl>cse: 

'nJe purpose ot Project No. ~-66-030 is to develop improved basic 

•obims am1 attacbmente frr -per.fcmni~ numeric arrd alphabetic smbetitutiou 

amd otb&r operations used in crn>tOl087.. This eiquipmnt will be used by CSQAS .. 92-

c. Description: 

. The NC-4 Mark n wi 11. b9 analogous ta the commErical IBM reproducer 

except tbat.tbere vill be an additional set of 80 brushes in each teed end a 

ooardinatins tea~ Which will control feeding clependillS •• the .readi!lg 1n 

tie two feeds. In additi'on it vill be desigraed to penait attachememt of various 

special devices such as the' alphabetic subst1tuticm device for centrolllng its 

operations. 'l'he alphabetic substitution device will permit the encipharment Oil' 

decipherment ot pen~phic •terial at the rate of 100 pentaerat>he a minute. 

' !he aubat1tu1m d.e'rice will haw a 32 : 32 matrix which will be completely 

flexible to accomodate uq set at 32 32...element eeguences. 

CONFIDENTIAL 

Declassified and approved for release by NSA on 08-07-2013 pursuantto E .0. 13523 
., 

• 

a. Belataa' Ma:terial.1 

!1?he JC-b. Mark. 1· ltsohiMs new in l.18S'b7 CSOAS-92 wex-e bt1i1t tar the 

lfaq during tine if~ and ~ bad.11" in mec1 Gt replacemlitnt. Their daaign 4caa net 

pendt 1111m7 tunct1cma ubich nll. be Clea~ in the DC.J&. ~II. 

e .. DnalOJ9!! JliatFLUld ~tm: 

A P"O:Jeot ma been rat up bf the Bureau cf Sllipa foi- iesip am 

cOD8truct1rm or tba NC-4 Mu-k IJ ea tor certain auxiliu7 eqUipmnt aa indicatal 

in the specf.t1cat1ons attiacbsd u an lb:hibi t. D9s~ vork bas been comple'tsd bf 

thl Intemat1om1 Buiueaa Mlchines C~tion ad CODl!ft:t'V.Ct1m is maw wq • .. t •. ' l'£opoaec! Dnalopupt: 

'rid.a lll"O~ect vill be conducted 1mder contZ'a.Ct mgctiatsd bJ the 

D&."111 to which t~ Arrq Secm'1t;r Agfmo7 'ttiU. traiatfll' flmb. · 

(l) Pbaaee ot the pro~e1ct :l.llcltlde ~elopmimt 9 emgineerills, and 

'enice teata. 

(2) · llromi een1ce test moaele of the :wc.J&. Muok n vill· be re4uired 

and. one service tell?t model at the alphabetic aubstitution 

cln1.ce vill be requil'ed. Tho service teats vill be made bf 

. CSGAS-92 and ·~ .. 

(3) · Pr1C2tl"1t7 10 1• recoaenaea, within tl1e terms ot Par 3a(2)(c) 

· ~Var Dapartmant C:lz>cular 71, 18 March 1947,, because at the 

intended 1189 in crn>ta:Da1"1c problems. 

{4) The estimated cost ot this pro~ect to the ArmJ Secur1tJ' .Agemic;y 

' 1a $7Je.,800.. . 

(5) Itevelopmant will be completect. in approxim.telJ 1.8 mmtha after 

.tbe apprOYal at hoject '29-66..0300 , 

g.. SeCUl'it;r Claaa1f'1oation~ 

. . ;tl) · The eqtd.pmsnt while under cieTelopmant vU.l be classitied 

·COltlflDD.l!I.Al., RISTBIC!'Jm dter dnelopmant. 

(2) Thia equipment will be ocma:ldered in the "l1mi~dav oatagor7. 

·(3) CrntOSE'&Pb1c clearance will not be required f~ t>WSCDDel 

concerned 1n the development. 

3. BICOMtCmlTlO!IJ: 

~ Subcommittee recOJD1119nda that 'Pl.-oject 29-66.030, NC.A Mark II, mid 

Alphabetic Subat1tut1on Davice be eetabl1sbed1 claaaUied ea Develop11ent T7P9, 

Sen1ce Teat ~ne, and aasiened a priorit7 ot 1.C .. 

CONFIDENTIAL 
I 

4. ~g 

~-~ • • 

Ao ~CSJ&i OO!li~ ~C'Wi!Sltie®. 

w. Slpecruf'i~ti~ liOO.Ja. ~ XI Wa-q ~l 

CJmt JWSM~ Seie ~ ~...680. 

1001l.I; JiEM~:l!.t ia00 net attach@Ql heNtc. Will be availl.abll.e at 

Tilcknicw.l COBitiliee ~aptiq. 

5o ~:X:Qm: 

, ReJQr!~te..t!ve 

Lt. coma.mer J.m Sld.mnsr » !llllSMps 

LEO-R0s1B 

Cbail'l!l!!m» Cr;vptoloSic 

S11bcomilittff » .M!ATC 
• 

.. 

• 

:Propoaect MilitarJ' f'baracWriBt1be tor ie...4 Mai: II 

&104.A1'11&'9t1o Sub~titu.t1ca Dav!oe 

I• 0.Geal lnt0l"l!Lat1D 

Ao ?1>.1!.ot1ve : 

l. !be ~3eet ct tllie-~~~t :t•.w P"~uce (a) a .._-machine 

a11111.ar in ~tun to tb8 .»'"~sent ~-la. (a t~ f/l preeemiitg ;pmicb) but mv1El!g 

i11craaeea. ce.pacitJ ot .control ~ corapu.tati~,. mon fln:ibil1't1 an4 i111P3Dved 

ac~7 ancl {'b) an alpbabetic titt'bst1tut1cm 4"-ice attaohabl.e to tbe lra8e . macbS.. 

2.. Equip!Dellt till the t1'P8 a.scribed harem_ is reguirea w~ite 

c1ec1pbe2"1'19tmt alMl to permit eu'batit12tian operaticms ct vanou t1P8•• In 

add1t10ll!J., other crnto1Cg1o funct1oea, e .. g., th08$ tmolYed. :in tr.e.mapC11ition solut1an and a.acodi»a, can be prfcrmed .. ' •' 

Bo l'unot10l!ll8.1 Cbaraot&ristibs 

l. ·.The BC.J&. Mark ll ahou.14 bave e.e its general tuncticma: 

' . a. Tranecripticm ct iDf'ONaticm f'ro11Pae f'ila or ~ caraa 

to anfltber .. 

b.. Compariaaim of data betWea i,ro tiles of. cuda in such taahion 

.u to contlrol both th8 feeding aD! l,ilUbQbi.Da at ar4a. 

c.. SS111S1ng ct i'Dfmoma:tiion 'tor tm-ther .e:mtp1a a1l!ld pachmg the 

result ~ t'bSt am.qa1a into the same card trca which the 

.source data vu rea.4. 

cl.. COJDtrol bJ 'baee. nechim of variou aux11iar1 ~ices. 

· 2. The alpbabetio au'bst1 tutian de-vice shoulcl be attacblable tc the 

base machine 8:Dd ll!lhoUld penit simul:taneous deci~t. ot 1 t.o 5 t>OSitiona 

throagli a plUSSQ.ble matrilt bavillg a capac1t;r ftJI." 32 32-eta11lel1l't alphabets. 

Co !entati"f'e 1'ecbn!cal.CCDB1deratiODJ! 

1. fbe bas~ machine should have a fClll'm analogous to the present IBM 

tne 519 reprduoer with tJlo fol.loving principal cU.f:terences: 

a. 'l'hne reading stations in the reproduce feed. f 

'b. 'l'wo readilts atat1o:aa in the punch teed, om ~receding and 

ane·following tbe punch station. 

COF~f I DENTIAL 
. "' • 

e. Oo6ri!.1m.ting teature which W@ul4 pel'm1 t a ctmtrQl ot feed111g 

1D bath feede f~ns ant!Be ca.rd&. In adtitim, tbe 

cooi-dimtSXJg f&atm-e should 'JPtl'lllit emt?Ltol of puncbins mid 

ether func~icaa .of the machine. 

4. Pronm1aa fer atta·~ a1ld ooatrcl Of am1U8J7 in1.ee1. 

. 2. The alplllabetic eubatitimtion c11.evice 81l1Gll'IA ave the fcllovillJg 

cbanoter1rst1ce: 

a. A plusgabla matari: 1PSZ"ID11itiq ~el>~ car 32 32-elemant 

alpllabete. 

b. A choice of a:;· 32 cut at th& 38 atanclla:Pa ~ co«U11!88 f'or 

nault pmchii>a;o · 

. c. A cha1ce r8 mi 32 Rt of tba 38 etUilard DH ca41Dga te> 

oon't.?'el. the cciorilimtee of the matr!:. 

d. Abilit7 to bnus the mat.r:lx w~ a special charaoter 

repre&1entimg a siμoble occurs in either or both ks7 aDd 

cipber (or pla1Dl. 

e. Auquate provieiao to insure accurac7 al results o 

f. Ca11&c:lt7 to deoipher :from l to.!) positions for each card 

at the rate flt 100 card.a a ~ .. 

D. 'Bia equipment v1ll 'be uecl at fiZed ertat:toae. 

E. Tb& equipment will be 1Dstalled in fixed IBM installations ot the Army 

Securit7 .Apnc7 and other Cl!.';rptologio asenc1es. 

F. 'lhti ve:tslJ.t at the sciu1paent should not aoeed 125 lbs per square toot 

ot beartns ana. 'lb maximum dime.asime iltluld not ezcee4 btlipt 6 tt.» lfi~th 

4 ft.~ lensth ' ft. . 

G. _ '1'be 4ea1rable ~· ezpectance of the eQu!pment with reasonable 

mainteNGCe a~14 be 5 7,ars un4er either peace or TIU' con41tiOID8. 

II. Perfarmanc&. Requin•nts 

A. ~g'llipuant should canfcmn to the same ete.l:ldaris lNHJUi.1'$4 fOX' commerciall.v 

produced. lBM mohines. . 

Ill. Operations and Maintenance Cona1cl&rat1m 

A. ECJu1pment should. be ca:pable ot continuous operat:!.Gn ft>r 20 hour~ a clay .. 

CONFID£NTIAI. 
• 

J. ft~ MQ ncllaiD® ~ G11millia3r~ 6l'1'lri~ mu.~ no ~e ~ ~ 

C!pnt~ uia vitll 'll>~ mainta~ ~ 11siR1cra« ~ * .. psNmmal \Vl'D.o miml~m 

~ seniee otrlaeJr> mllA 11qui~imta 

IC. l?.re&d.igicm ffJr Jfi~H ~~mnc~ o 

11.. ·~~~ fGr fi~lil mi.ml~G> e;ibnlltbl ~ eiiili~ t@ ~@:ii~ 

f~ ~ mM fJ~Jliiptmt.. . 

1". ~1\Cl&l ~t@ril~~o 

&.. ~uipnnt 6.emip 11hou'il.d ~ ~~@ ecmi~'1.~itm lil-lioitJ' ~ ~iim .... 

~,, zmiBllllDl JPCli!E.lil»h urn:a> Cf' w~ ~ -oi ~ IBlimi'!B e@ll!Slii61.GlrQtiomi 

l!&~ll)JJ ixfuoj),wd in• <6l<HJip !Di'~ @iqiui~t .. 

m. ine ~~v.ipuD~ ~c\U\Ul. ~ts flr~ u .. c wcltrID 60 o1'01e 11itm1J1.s 

pnmss '~mo nllP,~o ·. 

Co ftis .'~~ipmmtnll Tl>e Wiled 1111 Plbaas IV of mix- cpwati&sl. 

». b omaitl"121.Ction in so tm> u ruge4Iaee.11D wmpmoa.tm-e Utdts,, ~tc .. ahcvli pe>X'mi t sMpmmt to anclL installation at ~ fixe~ DH 1metaU£tion of 

the AR'1 Secllm"i tJ ~. 

-CONFIDENTIAL