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REF ID:A39507 

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pproved for Release by NSA on 09-30-2013 pursuant to E.O. 

13526 

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REF ID:A39507 

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.,. • ... ., • J'riadan 

l. Thia inYentioa deal.a w1'Ul a 017ptosraph10 •ohine in *1ch the 017ptograph1a 

pr1DD1ple ia baa1ca~ u tollon: 

Pmer 111 del1Tored w the JaQ'board at tb.e eno1phor1JJS po•1t1on at a aoeo1t1o 1n· ,. - at.at 1ll a period of 20 ,possible iDDtanta, the cipher resultant ot a giftD plain. .. ten let.'91' clepa'1141DS theretore upon the apeo1f 1c 1nataut 'the lmJ'bl.>artl. 1• •de 

-.11,.e", a1Doe for eaoh of the 26 dU'terat imltaata a d.1ttere.ut 111..xed o11*er al-

)ba'bet ia preeatecl tor encipnmat.. !Ile ordn' or preeelltat.1oa ot o11*er alpba- 'beta 1• :replar 'but tbe oxaot tut.ant of tbe •elect1oD of a apeo1t1o otliler al:pbabet 1a veey 1rreplar alld d.egenda upon a keJiDS faotor. 

2. 'file •ohim oom1aw ltaa1cal.q ot a •1DS1•1 oonatant.11' rotatins, 26 ~' 

26 obanater oi,pher ocmm.tator, labeled 1 ln l'ipre #1, oontrollad 'b1 a D71118 

qnem 1nolDtll:ns a aet of mtatal»le, 41ft'tll'ellt1al ca wheelll or u ep1•lellt eleotrioal oaa ~t. 'Dl1• oontrol qatm ocapriaea 5 or a mlt!ple of 5 

aaa wbaela wld.cb opeza\e oontaot l.fmml1 aholm. at 2. The 1nt.er-aot1on ot tJle ' 

con.tact lnere nault.a 1n aet;t1Jl8 up at 1il1e .5 rel.IQ'•, '' ~. '" 6, 11 a l)91W.ltat1on 

in the Bozrdmwc ood.e. Correaponding to thi• pez"llll'8t1on tbel'9 1a set up a pnmt.at1on. of 5 tanalater ban, labelea. 8, 91 101 ll1 12. Th~ae are alottea -1len 

and when a •peo1t1o pcmm:tat1on ia set up, one o~ 32 etunt ban falla :tmo plaoe 

and. closee a oontaot. Snoral ot these contacto are 8hcND. :tn th~ altetoh at 13. 

'l'heae c1rou1t.a lead t.o a •itohbuard 141 on one aide ot which there al'e '2 poa1-

tiona aDl OIL the other Bide ot which tbere are onlJ 26 pom1t.1ona. BeferriDg to 

the aaa wheela tbeao are of d.U:terent dtamete:r and of d1ff erent nwnb"l'G ot 1nter-

,..l•, ,preren'b.11' all pr!M \o om uotla•. !JMt7 an 11111Y14•1ll' rotatable 1n 

atep-wiae 'Ml'Mr, msder caatrol ot tbeDJ"'boud. !Jle ;potential cipher kq wbioh 

:reRl.ta haa nob aD ~ 18 1zl leagtb \Jae Jl'0Cb1.01i of the iD41Tidual 1Dtft'• 

•l 1•wben ot the Hwnl oea wheel.a. -.or em.ple, 1t tbm9 an ' caa 'llheels 

the tirllt ot lOO 1Jltenal8, the HOoDl of 991 the Wr4 ~ VI, tM fOU'th of 91 

aJl4 the f1ttll of 89 tntenala, 'tM total llll8Ul ot the oipber a, mal4 be 

11m 1 Jt691700. 'nil• •nl1' •••• \laa\ 1'119 o1J)aer kq •olll.4 win ot an un1ntell1gll»le aetmmoe of o1]1Mr1.1ts laQ' obano1ien ot OOIT99Jtm.Una 1-Ul· 

'· !'he '2 P>••1ble rualtaat ~ permtat1ona 111h1ah are le4 to ..S.toh'board 

lit an tor the parpo•• ~ t.ld• im'mUcm reduced to 26 1V' oomollkt1118 6 of . 1ihe '2 o1rou1t. i:pto the ot.Hr 26, "° tbat tbont w1ll 1>e oDl.1' 26 41rtenst resultant etteat• tor a;ntoarapldo ke71lll JR»086•· In tlda 11mtaUoa '11.t• 1• aoaom.-

"Jlllllaed t.ui to a:lmp~ 'bJ' tald12g wbat. are uua1J3 Jmown aa the 6 e:ftn hnations 

am tlarcM1DS t.b-. in with 6 r4 u. oua.r 26 letter-reprea-.\1118 ~ pemutatiom. Wbioh 6 will be aeleo'ted to lie • .,_.le-repreaentat1om• _. h 4etera1necl Ull wried at •1ll at. the nitabboal'll 1 .... 
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REF ID:A39507 

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It. ID Wa 1m'ent1on 1ibe 26 apec1f1o etteota tlau nDlered po••1ble 1'J CUl 

aot1oa mreJi" 4.etaadm 11bloh om ot 26 •...-i. Will be ac1.e •a11Te• (tbat 

1•1 will be cmmectecl to a powr llOVOe) OD a H1i of 26 ......-. 1a the 41•-

trllator :blad 1'1 OTer 11h1cll 'braab. J6 ... pa 111 8Jl'Ohron1• •1th ~•tor 

Wheel fl. All llholm in tlae fipn, W• anloa ---~ MaD8 that at. a stwa 

:lmtaat nlq 17 1• 9ll81'g11e4, 1ilae illltam ot ••rai.sat1on 'be1D8 ooatrollea 

b;r t.lae oaa aznngemoat and •111 be 41ttennt for Moll Jra7 o:perat1ca at. tu 

kq'bolml. 

'· tlb• a epea1t1o MsrllJlt. of tlae 41•tr11111Lto%" 1' 1• •n "alive" bJ 'be1J18 

ccm::.ot.ecl to a JOWl" aov.rce, all4 *-\be 1a'uh am J6 naallea t1a11 live •es- _., tile -.r11oarc1 ot the OZ'IPtosral'h 1• ..ae "a11Te• at· t.IJat tmturt 'bJ' the 

ocmplet1cm ot the o1rou1t. trcm :powr ll01IZ'09 lB at oontact 19. It a kq 1• 

depreaaed 4'11"1Dg tbat 07cle, t.he latter •Ol"l'88p>D41111 to tbat DJ will be •-

o1pbeftd 111. the apeo1f1o a1itiR alpbabet tleteza1ne4 'b7 tbe apte1t:lc anplar 

po11t1on ot the ci:gber oc:mnutator fl at the iD8tant tlat the brlUlh am 16 

reaahe• the liTe eep.ent on dtatr1butor 15. In other words, the b71K>ard 11 

•de "aU'Y•• at l ot 26 41tterent 1natut1 ill the 07cle ,P188ecl throuih b7 the 

aomutator 11heel; each ot theee 1Dlltants correepoll4a to a ditfe19t Jl1xed 

alphabet of which there 11 a total ot 26. It 11 to 'be 1Uldentoocl tat the 

aaa 111.Leel uatmb]J' 1a aet at u 1.n1t1al Jre7ing :poa1UOD "bJ pre~ 

aD4 tbat the oams udvance one atep or interval per depreealon of the te7'board 

Ul4 ao mro. 

6. The olJber camrmtator mB.1' be made a noipi'Vr;nl o1pher c~tator; or 'b7 

n1tabl8 aw1tohing arrangamenta a nrmrec1procal eracipher1DS-do01pber1Ds relat1omla1p mq be provided. tor, it deaired. 

T. !he lmJ"boud 20 ts comooted to t.he left.band baull t.e separator 21, am 

'tlMt o11'CU1ta paaa rraa 21 tb:roaatJ. cipher ocm111tator #1 to t.he r1ptJumd baa ... lite aepuator 22 aD4 tJ:Jeme to the 'baDt of 1Dl1cat1na deTicea ~,, back to 

pa1rer SO'Ql'Oe .lB. 

8. Means and o1rcu1 ta lllllSt be ~ov1ded to preTont tho cryptogra:;ih from noord• 

1Dg or 1Dd1cat1na a reeult.ant JICll"e tmn onae tor '\he - aet up at av-, 80 

tat tb8re ~ be one an4 oul3' one cipher equtnlent ;per ke;r1D8 operation. 

9. Iutead ot a aet of 6 tmnalater bare ancl 32 atuzrt, bars an ~tot 

mlt1ple oontaot :rel.Q'• aa abolm 1ll 11gure /e. at 2,. 181' be proT14ed it 4._d 

mn :praoUoable t!an tnulater 'ban. 

10. -.or cleci}lbe:rment, ha'Y1JJS a no1Jll'QO&l c1Jiler1118 ocmmtator tlae D7 •ntDa 

or tile Giii& 'llbeel.8 "be1118 tbe - u tllie 1111tSal aett1Jlg at \he eno1Jber1118 ell4 

the HtUDCe of D71zls obanoten wo1ll4 '9 11mU•l at tbe dec1Jber!DS eat 

aDll '1le no1proo1tif betw• plaill-tezt allll o1Jber olluaoten ia •atabl111bed. 

tllroq1l the o1pllft acmaatator aD4 tbe a.G1Jla9••8' 18 etteoW 1n a aS.ple 

•zmer, t.llat. 1•, it at enc1Jilezmm at a gt'ND tmtaat A epall K then 11& 

cleclpbermnt at that homlogoa 1mtant (with reapeot to the oi;iler k0;r) K 

wcml4 be 4eo1plLerecl aa A.