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REF ID:A4148565 

, RESTRICTED 

Rear Admiral Earl E. Stone, Director 

Armed Forces Security Agency Council 

J801 Nebraska Avenue 

Washington, D. C. 

Dear Earl: 

() 

.5 June 1951 

I am inclosing a letter from General Corput and a prospectus 

concerning a cryptographic device which apparen~ly is capable of 

a high degree of security. 

It is considere4 that .AFSA may be interested in obtaining 

teat equipments and might even consider proprietary rights. If 

the EUCOM Sign~ Divl.eion can be of any assistance, I will be 

pleased to act as intermediary. 

2 Incls 

1. Ltr fm Gen Corput, 

1 Jun 51 

2. Ltr fm Col Cowles, 

15 '.·iay 51, w/prospectue 

Sincerely, 

1f. T •. GUEST . 

Brigadier General.., USA 

Chief, Sigxial Plans & Operations Division 

Declassified and approved for release by NSA on 11-18-2014 pursuant to E .0. 1352a 

I \.. RtSTRiCTED !•---:~-------··"----··- ------------ - ----- --------- ·--- ___ J 
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I r.hd. 1nu.· l ____ _ 

REF ID:A4148565 

No. 163e . (~ .. ......_) 

3 -

'l'he co.'.i.J':::>~>itl.or1 oi" t!1e cryr to-iwpulse coa.bi110.tions varies f>rom 

sig'!1 to aii.:,1.: ur1d the suries of t.be8e vnriotions is to all 

If one f.i. would always strike 

the key 11,~· , trie:i the .cir·bered iu.pulse co,11biu,1tious in t.ce line 

,.,.,~ .,. 3 .1:.•·G• 

the h;tter ., c·, 1.tcco:r·diu~ to tile 5-pul:-:;e codE:~. 1 - 5 are 

+ ;, ':.:.eu currc-rn.t and - no cul:re nt . 

.:..ine J. !.:3.t,O\'.~~ the .iu.i LllSe Crn::biu.o.tiOLl, fl'OclU(;ed by the 

t•2lc'NTitc·r, line c ~hO\\:; ::i. cr:rrto ir11; .. i.L.:;e coti;binati.on, .in 

L:.i~1 CJc;L.:·J·1C the co1rbi~\~1t:i.on for ti...1e .Letter "L". In tl-1.e 

lit:e 3 '.!~ulti.1.·liecl rrod,uc:;t of lir.es l t-Ld 2 is ot.tutned of the 

eJ.c... cr;tury i1:.r. 11lseF. 'H:e con·J<:-:rsio:n i.s done C1.ccordJ.ng to the 

·f'nllol' lt.1" r·;le of a r:..ult.i!.l.ie~.t ion 

-~ 't'" -· + •t· = 

=- -t· -! -

lf ti1e "line i': 

tOI·iecl ;.it:!". o. teJ.e\'.Tit.e·!' (•.0 i.thont t~J.ecrypto), 

oi.1 I ui1.~ed tl:.e J.etter ''(," ir.!ste;1d of ":t.•· 

there t•:ill be 

Fr'.) .... t::...c lir;es 4 - 6 wi1l b~.· seet. t~i:..i.t t:)e origine.l :1ign 

CO~ bL1;.LtiO:..'' U$ j,J'Ot.htced u:,- tl.H:; ;::;CL1d.iDg tcle::rit.er, will be 

rec:~.:-.5titl.1t.t.:d b~ the wultiplic·.•ti•)r.i cl' the c~.;hered iffli't:;.lse 

cc-.bi!;:.;.tj.o.!1. d.th tbe corresj D:i.di,!:g cr:n·to iiurulse con.bino.tton. 

1\G rructj.c~:;.lly aJ.1 ·u.1.e ·.os:li!..le· .J.tff'er· nt ,i.J.rulse 

co.L)iti'.ttio::~ in t..!-i.is !.;ys·tei .. ::;t:tud fur sit:;l!!1 (::.ettc::t::.:, nu11.en.J.j.s, 

' . t· ., .. t ' . . '1° .... '."' ) 11 I l ' J.( U.0:,1 1 CJ I • f' C> I "" I 

e1.'-, ~c L.r.ov1. 

'I 

( 

': 

.A -"•·c • rli Zflricl1 ~ •. ~u 111 l<Mlo iJ l. ·I';' W 11.10 ---=-· ----~------------=-:........:.:;,_.;:,;.;.:.;;_~...;.;..;...;.;.-..;.....-,;;--.. 
'·· 

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'I' Mod. 1002 

\ \ ___ _ 

14-pulse system 

REF ID:A41485~ 

- 4 - u 

I o .1 3e ·. 

l'Ht.b the 14-pulse systeu. ubou't 16 1 GGO ivjpulse co:!..binuttons 

ca:u be obtai11ed; of thef.H~ onl:,.· 1 •• bout 5G c.:o:l!birL1.tious (= G,3/c) 

give rendr.1b lG signs. By the convcrsiol.l of" t.he c leur text 

combinations ·P.ith those o~· the cry1_.tc 3e:ri<:.:s, there -.·ill 

generully be obtained uuru.J.cL.b le ir.;~'.lllse COL.bir.:::.itions iiL the 

ciphc:·red ir.:;r:ulse sc.;:r.ief?, so t~.1at (:H"< ")." .'::.l::iy .f'or .Lrn=;t .u1ce he 

chuo.ged into IS <71tc. A telewriter, br~11.c.'.ied on t".) t:.te 

cot:..r.>Jurd.cation charu1el, uud not eQ1J.irped ";":it:h :.i. telec:r.:,'[ to 

appu:r::ttus, •.•:ill here write t1n.rcuduh1.e sit:;n8. 

rfhe keyi11g ele: •. ents of tlle cirhering l<ey Se.rve tD olit•J.in 

the vari1.hJ.e cryrto-b.J-;.ll13e serie~3. 1-;.s cle.~er~ts for U:.e 

ci1•heril1g keys a number of w}.eel.s (!.'.i. 14) ::..:re U8E!C. 'l'hc;~·;~_.. 

J•in v·1heels c1..i.rrl a nu::_b0r of slid,,.ible or l'atJ.t:i.ble J in:::,1:~1ict 

c~1~:1 i.)e d.is/ ln.cc:(t i.nci.ivi·h.'!t1.:i.1y. by l:,:·u.:i, :.1.rJJ c·.i.n t ~·-9 t~o 

cc;r_t:~~~tH will be c~o::;ed (or Ol·ene"~). and vice vcr~1~ ju the 

othc.:r f'ositi')n. Euc.h J i..n is de1.'i.ricd b:, .'..!. !\"';.J~)l"r :)f'! Vie 

circu.i.:fercnce o . .:: t.he r•in 1-.i1ee1 ( }.e:r nuruher). 'fiJC~.;r; 1:cy 

numbE"rs ~re a..Lso used to d:..f'i.r .. e t:~:e st'.1rtj.n('.' ; c~ii t .i 01..;s o:..~ t~.!.f' 

l;in 'I.heels. 

r.;oves thet. u.fter e;_tc .. b tr1i.n:..;!.itted s.ign, in u..n irret:u1<.r r.;:..:.mH .. 'l". 

-'fhe i~ove::1c:1t rhyt.h."1.R Cu.i~ be v .1r iccl :~Lid cu.n be cJ.1fan,:,;ed 

urbitr~rily by hand. 

. .. . . l ... ..::~ 

a 3pecial syste~. 

wh:ich has fj,V<il ~ec'i..ors f~Jr the 5-i•Ul:JC? :c::·'Stei.. (;J.rltl 14 SEK:t.o:.·3 

"' . t ~ 14 .. -, ,.. '' ('.'· 1·· .. ~ 01 ,1e -1, ll.~.:..e s .'f·" . e •. 1. 

rr"" 

.1. De , . I :.ire e i 1.11er 

electrically· QCtiv:J.ted., or 1Wt, de] euLi..ng on t.1·,e 1·os.Ltiun of 

the pin v hee lf.;. 

a 5-f'\llse or 14--pulse crrn.bL'.:.atio1:, or tr ... e 30 called er; t to 

imp~lse srries, is obtuiLcd. 

JJ...!l excecdl.n.gl~·· c:or>,·! .i..ieated ''i l'01~r·~:i.' f'oT· t:!e ecL., o:::it1cn 

cf tbe cr~1;t'J iw1 nJ.:--:e s-"'l'ie::~~ i:J 0;·;1 1:!.od on .?.rc:c...:::t r:> · ti:e 

,\, ,,tt·li-li•'rli .1.i)r icll r,..:Q 1h IUftit,_I fl I. t7 W 1110 

~---------- ---- --
.) •.. 

~ -. 

• 

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I~, -

. I 

:•·.Mod. 1002 

'-.'<"~l -

REF ID:A4148565 

{ ·-.., . ' 

\.../ .·~o .· 163e 

systelli used ..:·or tl:!e co onec·t .i cu 1·ir.: r ~-· 

'~ . 

If t.i. tbe first imp1lse ele::.e::r:t c:iv:.-:3 '

11.::'":U'rer,t" :tT rnt 1.::.y 

depend en t.te rosi ti on o~.' ur t'.) 12 'ili ::.1:.2el2, ·.•!,~ thel:c 

rosition at th:..:'l :.ii;Jwer~t is de1 e1:del!t CD Li.e ;:;~·:d)i·~~:tL)!.~: ·_:;_,,:ed 

for the .!...OVewent of' t!J.e ~-in w.i:l.eels 11.~ 'co t:.,;..t .10::.et!t . 

• "l.dd:i.tio.r.L'..il keyir-i,; e~.e"et.ts ::re ~~::.sc 

ci;:heriug (;eru,ut:.ttior.1 ) collector~:, o:f· 

SUr;j1lied. rr.nis i:J a--ij·ust::i.ble Oj haud. 

.. · -.. -. .... J_ _, j.,_J_j • • ~ .;"') 

,.. .. ~·-

one or t 1::0 extro ci1·llering collectors, >..~icl-. obt:d u ·t.:::· ~:-. ·e 

irreg-.1l.!.i.l' kind of !,,ovei:ce:~t 3S t.'.::;e fiO ;;i:eE'.J.!i, ~ .. re c.~.1~30 :>E:: lice!. 

'lhe cipheri!.i.g collectors are ...::i:;.r~..:ed ou tbeir \Jirc..:.:.t.:i·~n:>L:!e 

'.'l'ith nu!.11erals in order to de.f'i:<.e t:-~eir 3ts.rtin.g f ositi~.!is . 

'i'here are falso su1rlied spec lul coD.::.ect0r r l .• te.:;, .·'._·..i.r_.:.:.... c._.t 

exchanged in a very Giu:ple wu.y. 

The rill '.\heels '.U~d t:.:ie t· ... o ci;~er:i.tit;: C:>llector·3 ··.Lth 

auto!!.atic i:.ove~:ents PS 1 ::i.nd .i·.3 2 (Fi,::. 4) .:..re ; .. 0...;.:1tcd o ii 

sb.n.ft ut the froGt en.d c:" t'.-:.e a:1 ~~rntus, ~·i::i.i:i..e l .. c ..... d 

orer~ted c iJ her i1;g collector r. 3 3 is to 1Je f o·;.~d :1t t' .e :- _;__.;:~·~t 

lw:nd side of cover of the .:;;::.cbi :1e. 

•'fe distiuguL1h betY.een iLtcrior ur;d et-t::r1or sett:i.r:::s. 

'Ihe interior settings '..1Te c:~1unc;ed t:.ore :r less fre·j 1J.e:: .. :.:1~-. 

deJ eLl.ding on tae intcnsi t)1 of' ti:e er.\ l to s.;;rv ice, -. ji 1.0 t~~e 

exterior settings a.re co:,,r oseu w!,c:1 st·cr:·ting '.l cc ... i.utll.nc :tLn~ 

series, or ever.t•.la.lly evf.!r·:l ti'!.e a tele~:r~l.w i3 seLt.. 

'Ihe TKG 5/14 .:-.llows the fol. m·. i ;+-:; ~:ey ~'.iei. t i7·..,=.:s 

a) Interior key set~lngs. 

1. 'I'he i oa.itlonir!g of' tt,e ~-..ins .01: tl-'.e 11:. wheels, ··:.i:<--

t Ot3.l c..b O'J.t 5GC. 

2. Arbitrary arri.lo.t;eL.e.nt OJ. ·"t·~ .. ·t· .,. •·,,'l' ._e .:.ove: .. e~i 1 rv.:-- ...... L - v •. 

3. 'l'be ci::..oice o:· different co:::rn.ect.i.~~D : ~.!'.i.e~~ for L':e 

ciphering col.!.ectors. 

~ ' ... -·· _e 

1 - .;\:; 

A. A\l .. fl.:iil~r!I Zilrich !i~I(} w lOOO Ill. t7 W tllU