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ORGANIZATION AND LOCATION 0 o-rD D FORM 9 5 Replaces DA AGO Fozm 895, J Apr 48, and AFHQ I FEB 50 Form 12.10 Nov 47, which ma7 tie used. 

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-- -- - -------------~--------- ! ,,. ....... . . ... REF ID:A72379 

Jan. 26, 1951. 

Civilingenjor 

Boris Hagelin 

Post-War development work on ciphering devices 

by Boris Hagel.in. 

Dur1ng the first two or three )'ears after the cessation ot hostilities 

I llJldnq tried to take stock o:t the situation in the f'ield. or ciphering 

devices am. their uses, and I returned to the actual work of developing 

new derices onl.7 very gradual.17 in '47. 

I waa aware ot the absolute securitT, ottered by the proper use ot the 

so-called one time blank BJ"stem, and I also designed mechanisms tor its 

application on the ciphering machines alreadJ' mnutactured on license 

'bJ" A.B.Cryptotelcn1.k 1n Stockholm, SWeden. I did not however bring Ul1' 

ot those designs on the market,, as I felt that no practical solution as 

to the ~ of' the one time key tapes was &\rail.able. 

I did however construct a machine for the production ot one time blanks, 

to be used for the ciphering ot number codes; such ma.chines are at 

present in use. 

It was only in 1949, when work was sta..-t.ed on devices tor the direct 

ciphering and. deciphering of teletype ccmr.unicat~ons, that I began to 

devote a considerable part or my tilte tor the construction of new 

cipheriri.g devices. It was in this con..'1ection that a new displacing 

mechanism was invented, and it was subsequent~ found that this mscba.."lis:i 

could be used for a number or diffe~ent deviCeD. 

A sho:-t summary ot the dav!ces, now being designed e.r.d developed following my instructions at thG A .. B.Gryptotekni..!< is given below: 

1/ A machine for the cipherir1g ar.d deciphering of teletype cc..":!!Tru..'1!ce.tions. 

Apart from the new tJpe or ciphering mechaniem, us:LTtg the displacing 

mechanism mentioned above, this mchine features a construction, which 

prcduces undistorted cipher signals under all transmitting conditions. 

2/ A small mechanical ciphering ma.chine, similar in operation to the 

converter tJ'pe ll-209. This machine features freely exchangeable key 

'Wheels (otwhich there can be had about 12 different viheels), e.."":Changeab!e 

drum bars, and w..ol".:llngeable type wheels. T'ne key \meels he.ve 211 irregul:l!' 

advancing movem~mt, the ch:ira.ct.eristics of \';hich ca11 be cha:iged at tdJ.l 

by the o:;ierator. 'Ihe l!l!l.Chine \rlll be norl!.ally built t.o print on two tapas 

(clear tex=..:. and cipher) • 

3/ A large Ir:.3cha~,ica.l cipharing .macli.ine, f'Ol'" col"respondence wlth the small 

me.chine as par 2/ above. Thia ~chine is being designed fer an operating 

spaed of 4-5 sigr1s pe:r sec .,r.d. It, can be equipped .. -.1. th a shitting 

mechanism, to a!.lorr the direct ciphe1"ing of bc·::.h lette1'"s and fip,ures, and 

vlill allow t.a"le uae or E'.J.V :-iur.ibor or di:i":fere1-:.t,_y arrc11ged alphabet.s. 

4/ A large elect~ical cip3ering machi~e, ~here the ciphering is obtained 

by electrical n:.e3.l1s, operating e.t a speed of a'.l. 7 signs per second. I"(, 

is m.y intention to add a re9cha.nis.rn i•:hich r.ould t.rans.f'orm this !!'.a.chine i:::::.o 

a cipherlng telet.n>e. 

A mechaniSLJ, employil'.g ona tim.e key tape~ can bs substituted for the key 

wheels in any one of ·t.he above four machine types, arid a ma.chi~e !or the 

production or these :tia.pes can also be supplied, if r..esd. aris3s. 

(Signed) BORIS i!J\GFLIN 

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