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/ ·. 0COP SECRE1REF ID: A58949 , .1 - , ,... .• , " -

-·-- ·;; IH' ~ 1 :•uao --~ $ ~ '\"\. .. , ff I-.. I r 

.. . ·Aug. 5, 1950. l 

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J Memo I re new developments 1n ciphering d~vicee, by Boris Hagel1n, ZUg. ·~ ! .. ____________ ..,. 

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1. An aux111ary ciphering machine, provisionally called Cryptex mod.CI-.,~ 

·for the d1rect automatic ciphering of telewriter messagesi exchanged :\ 

,over normal"5•1mpulse telewriter channels. The machine w1, 1 work 9n :t~ 

either double current or single current c1pquits, or radio._ .1r 

The machine operates on the well known signal inversion principle, but.j J .. ·as.the five cipher signal elements are set up separately, and transm1~~ 

'ted independently of the incbming (from the telewr1ter) clear text' sig- nals, the line (cipher) signals will contain no telltale parasites •... 

The key {ciphering) impulses are obtained from four banks,o~ach normally carrying the 32 different possible impulse combinations, which can· . . be arranged and r~arranged in any desired seqy.ance. Four preselectors{· which are set for each message in desired starting positions, are 1n4 .: 

vidually displaced from one position to another with the aid of a ne~~: 

designed d1splaceing mechanism. With the use of three selector relays~ 

which are commanded from the same d1splace1ng mechanism, one of the 

tour simultaneously preselected impulse combinations are connected to 

the ciphering relays. r . The displaceing mechanism has been specially designed for the operat1o· 

or the selecting mechanism of this machine. It consists of a bar drum, 

carrying two sets of twelve bars ~ach, a set of six key wheels, and a~ 

interacting mechanism between the drum and the key wheels. The censhnu 

tion. 9f the .drum and the key wheels resembles outwardly th~t_. of t!le , converter M-209, the main difference is however that while in.the.M-20 

the key wbhels are displaced one step each time, with the aid or:a separate driving devhcaianere the drum bare and the key wheels interact 

with each other, and are poth used for ciphering purposes. Tl:irough the 

interactiorr, the key wheels are advanced irregularly, with 64 differer 

possibilities for each mmevement. This action is obtained in' the toll1 

wing wayf the drwn·bars are provided with special driving teeth, wh1cl 

mesh over intermed1ar~1n1ons with the gears of each key wheelf and ,. d~pend1ng on the arra ment of the key wheel pinst of the lugs'on.t~e> 

drum bars, and of the driving tc.eth (pf the bard, a1fferent combipatii:~• 

o,f _drum bars will on one hand be dtsplacecl, and different advancement 

combtnalions will on the other hand @e given to the key wheel's• 

' Two preselectors are placed at each end of the drum, with one a~ ~he 

front and one at the rear. For each d1splaae1ng movement th• drum revolves one ~lt revolution, when the four pDeeeledt~ra w1ll_be·aug~ec 

· ted to tour different irregular movements. ' 

In-front ot the six key wheels, contacts are place~, whiqh .a~e acte~ 

by, the pins (active pin - closed contact~,\nact1ve pin - open co~tact 

, 1 -'JJ!Y three of these contacts can be connected to the operating magnet; ' ~ ~ the three selector relays, and these will act in an irregular manner; 

I ' ·. the key wheels are advanced irregularly. , 1:' 

"While-the diameter of the key wheels will be the same as tor thos"e O• 

the converter M-209, they will have the following number or p1nsf :29; 

31;33,34,35 & 37. Another innovation is that they can be rearranied' 

sily in any sequence desired (720 possibilities). key wheel pins & 

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\ : ' A suitable cho1ae or driving tee~h combinations and/lugs will t-esult, \~ . : '.~easily changeable and to all practical purposes aperiodic key 1mpul~ '1\·, , ·: ·_;combination~ eerie~. ., • ;-- • • ~ 1"• ~ .. , M , ~ ....... · • '.D1mens1onss 12•.!' ' Prices depending on equipment, 1 • < -4 5 d ..,.~,· '·:.weight ~,,..,ab. o lba. tatld.allds P 1200s-'·each,,-~"' 

~v· • .A d~awing will! be sent at an early date. Factory.Stockho ~~ 

~;·, Incl~sure 3 to AFSA S~:rial ...-. d~ted ' ·.J ,. --~ ~: .. ~~_,.· 

Declassified and approved for release by NSA on 07-14-2014 pursuantto E.O. 1352a 

0COP SEGRE)