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'fOP SI!ieRF.l'f ·, SUEBS SE98R:t'Pf. lNPORMAHON. . a. s:=ms em.y · . - 7 January- 1952 

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I ' l£._ONFERENCE . . . , . Pa.rt . I.. -The Chronology ot Eve~te. 

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. PL\86-36/50 USG 3605 

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· .·9:"01. ·sECiiEd!~ · ~d tJiiJi»M1 

Declassified and approved for release by ~SA on 11-13-2014 _pursuant to E.O. 1352a · 
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Part II. The Devices DiSCUBB~d. 

la Thel 

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PL 86.:36/50 USC 3QQ5 · 

;:::=====:::;-" Thel Ii.a a rand0m key gen-rator. Basically it produces 

random binaey digits. An irregular altema.tj_z,..g curren~ when .below. a certain 

threshold activat.es the tiring- ot a two stage t!1Yratron tube, which changes 

its stage eveey two microseconds. The period of this alternating current 

is apout 50 Jnicrosecands and-35 periods are used to produce one binary' digit, 

this being determined by the final stage or· the th11"&tron tube. Five . consecutive digits are used to form-one or the 32 Baudot characters. In· 

the machine this is accomplished by.the setting of a-"pyrand.d" (what we call 

a "Chris:t.mas tree") ot relays and these send impulses .through a wire which· 

is plugged to an elec-tr.ic t1J)ewriter. A second key generator or the same . type in the machine uses the digits to control the punching of a ;-level tape. 

Thus the ma.chine contains two independent key g~nerators, one to produce tape, 

the other to operate an electric typewri~er. These can both be ~ simultaneously. CounterlJ are attached to 'both outputs and record the results. 

By setting switches on the machine, various combinations and suppressions 

ot the 32 oh&racters can be used to control the printer. ·For producing 

digits tWo of the 32 characters are suppressed and the rest are combi~ed 

in ten sets or 3 to print digits. For producing letters 6 of the 32 ~re suppressed. In addition the printing can ·be controlled to produce · groups of 4 or 5 -characters,, and spacing bet'Ween characters between groups, 

between lines, and b~tween pages can be' varied. -Suppres~i:ons ca.n be ~de 

in further W&7S.· In order to produce three letter call sign groups the 

letters Q and Z can be ·suppressed in the tirst position and the group SOS also 

suppressed. Random alphabets •7 'be produced b;.v suppressing .eli,ch ··letter 

arter its first occurrence. . It takes on an. av.erage 22 seconds. to produce 

a random al~bet in- _this way. Bi\r spacing propsrly this •i be used to 

prepare·reciprocal alpha.bets or stacker pairings .. 

2. The Automatic Device. 

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PL 86-36/50 USC 3605 

This is simply a·device ~C)rCombining·two tapes \for on-line transmission. 

·It awears to be the S&DJe·&s the.SIG'l'OT device1 of w~ose· existence the 

I I/They seem t~ feel that this is a very. valuable. . invention from a commercial ste.ndpoint •. 

3. · The Wired Wheel Ciphering Device o · 

This devi~e . is to use 10 wired wheels. Encipherment is to be in one 

direction through 5 of the wheel$, the other 5 controlling the stepping. 

There are to be no pluggable .features. The·. similarity t~ the ECM was · noticed b;.v us, but no comment was made to this. effect •. It i"s conceivable 

that this is an· inde~ndent .di~covery of the ECM ~nciplet._ _____ ___, 

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4. The LoW Echelon Enciphering Device. 

This is .to be a device·which slides two random aiphabets against each ~r. . 

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. S.· The CiphOft1' Device. PL86-36/50 USC 3605 

The d1scusa1on .ot this was on. v~rr general te~ \I . I 

mentioning time delay, noise addition, inversion, and other known 

principiea ot enciphering sound. He wa8 endeavoring. to produce a device 

which would give the moat·ta¢hful passible reproduction ot the sound. 

The onl7 real' novelty mentioned: was. a method ot recording sound lll&gnet.icB.lq 

on a·disc uaing some new coating. This was alleged to be vastq superior to 

magnetic tape. · 

Part III. Incidental Intelligence. 

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Part ·."iv.· Rec0Dllll9ndat1on. 

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PL 86-3.6/50 USC 3605 

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.~~,IL. MARSHALL HALL, JR. ( .. 

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PL 86-36/50 USC 3605 

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