• REF ID:A71118 

SUBJECT: Report of C~tacts Outside of Security Division 

TO: Plans and Operations Staff Date 24 BOT 1947 

~nizetion visited: lla"VY Communications Axmez 

e 

Person( a) contacted: command.er S).ler, Commander stienbeck. 11.r. Ruederman. 

Mr. Darnell 

Subject(a) discuased=TOT !ape Production 

The Modified SIGCUM (33 fype) 

fhe Development ot Compact SIGJODO 

:Results of discussion including commitments made: !he Na"VY was contactd'd by 

Mr. Brazm, irr. Kuhn. and the undersigned, in regard to obtaining date. on their 

TO! Tape Production System for possible use in redoir:ig our randomizer&. !heir 

plan is quite different from the one now being used by this Agency but all in 

all, it does not seem to otter any great advantages. It is my opinion that it 

will generate a ftry flat key but its operating oharacteristics will not even' 

come up to the standards DOID' beiJJJ; obtained in our Production. 

The essence ot the key generator is a SIGABA rewired to give possible 

mar_. space Baud arrangemm ta. A completely new rotor set up is used tor 

the generation of each tape which provides a great deal of security but it is 

not too desira.ble operationally. !he key is sent to a relay panel which de• 

term1nea either mark or space arrangements on the typing repert'eratora sending 

contacts. An artificial st.art pulse trips ott the key board ah&f't and the 

sending contacts tre:o.mnit the signal to the selector mechanism. Tapes a.re 

punched simultaneously aa they are in our system. HOID'ewr. if it was neoeaaary. 

the Bavy system of using the sending contacts 11t>uld allow more than one tape reperferator thus producing ma11y more like tapes. The timing for the segments /t ::Jdlll' 

.fY .. the end of the main shaft of tbe SIGABA. driving a gear train which will 

°..i.._8!~ ....... 8;. ... cfp~-~- ~Bf.ter ~.qo....,..o~eratJ.ona. (Navy usea 600 character segment• in• ~fffllff//ftfffr'H~ff stead of the 360 uaed by the Aniy.) At 

this time• an operator must oOmB over to the operating panel and operate a aeries 

otswitchea to punch the numbering holes into -the tape. It is myr opinion that 

this characteristic is the greatest los$ to their system for the following 

reasons: 

a. It slows up tape production because the equipment has to atop for 

approximately thirty seoonda tor every segment. 

b. The sequence 0£ levers to be operated is conducive to operating 

error whioh would result in incorrect segment numbering. 

c. Because of the electromagnetic&! principles in setting up and 

SIS·SC Form No. 1475 

(Rev) 15 Mar 45 

' \ 

Name r1 R~k . 

B .,._ran_c_h_,. .. ~ Section 

@'pproved for Release by NSA on 05-29-2014 pursuantto E.O. 1352a 
' 

• REF ID:A7111~ 

stmJECT: Report of Contacts Outside of Security Division 

TO: Plans and Operations Staff 

OManizetion visited: NaTy oomnun1cations AJ:mex 

Page 2 

Date 24 lfoy J;i4 '1 

Person( a) contacted: Commmder Siler, Command.er Stienbeck, Mr· Ruederman. 

:ur .. Darnell 

Subject( s) discussed: TOT Tape Production 

The Modi£1ed SIGCUM (.SS Type) 

The Development of Compact SIGJODO 

~esults of discussion including commitments made: 

accomplishing the numbers by the operating of these levers, the 

le"Vera must be operated "Very slowly so as to allow the relays to operate 

in sequence. This to~ ia a very \Uldesirable condition. 

I e. 

3 lllaTy Tapes contain 25 segments of 600 characters each .tii about 45 

m • These tapes are wound by a hand wincler on to wooden centers. The 

idea the wooden center seems fairly good but one of our electrical wind.era 

certainly would be very advantageous to them for winchng their tape. 

Because of the difference in size of tapes and. amount of equipment. a true 

picture can not be obtained in the number of tapes produced per day by ASA al3d 

NOA.· Howeftr, judging from. the amount of tape used, it is estimated that the 

Navy equipment produces om•half the number of key characteristics per unit as 

compared to ASA' a present system. It is my opinion that even though the equip• 

ment does produce a flat key it is too complicated operatio:aally to be considered 

as a solution to our TOT Tape production problem. 

The Modified SIGCUM (Navy 33 Type)• was also exa.mned. They haw taken 

~~ ,s;~-,,_s, .. ~~ .1,-.,_r.o_~ the security which includes ~lexing through the maze and 

~~/JJ'/pf~~~jlJ transposition the addition and subtraction of the Bauds. They feel that they have the security up to a point where 

they may operate the device for 24 hours on one setting. From all appearances. 

the changes seem to be more ill a major than a minor category• and it is felt that 

they are def1Di tely improving the SIGCUll but they are not getting up to the 

standards of the JI[ 519. 

Compaot SIGJODO (Navy off•line equipment). This proJect ia still in early 

stages ot development but great strides haft been made in making tbe equipment 

much more compact.. This device will accomplish almost the same functions of 

SIGJODO al3d. yet it 1B incorporated into the SIGABA 1ncreaaing its width 

approximately five inches and increuing the depth the same amount. The tape 

tranSDll.tter head ia located to the left of tne prel\ent SIGA.BA.. Thia device 

Name 1 Rank 

SIS-SC Form No. 1475 

(Rev) 15 Mar 45 

, 

Section 
... • REF ID :A71118 • 

SUBJECT· Report of Contacts Outside of Security Division 

TO: Plans and Operations Staff 

~nization visited: Na"Y' Cammunioations Annex 

Page 3 

Date 24 Nov 1947 

PersOll(.&) coatacted: Commander Siler• Conmander Stienbeck• Mr· Ruederman• 

Ur. Darnell 

SubJect(s) diecueeed· TOT Tape Production 

The :Modified SIGCUM (33 Type) 

The Development ot Compact SIGJODO 

Results of discussion including commitments made: 

will allow the operator to punch clear text on the key board and come out with 

a perforated cipher tape. 

However. this cipher will not be operated in code groupa. It will be a 

continoua line ot characters. This 11111 neoesai tate having similar devices on 

1the_other end. of the circuit and. will not allow the traffio to be broken by a 

conventional SIGABA. holding that cryptographic system. Thia is a wry bad 

characteristic. The CW tra:f'fic • however, can be taken care ot because this 

device will still contain the atard. ard AB.A. printing hea.d which will produce 

a copy ot the enciphered text and produce the grouping mechanically. The 

J4odel under development now utilizes Christmas Tree circuits made with Lake 

rellaya but Commam:ler Stienbeck stated that they planned to try the 5•32 

translators denloped by tbe M'my for the n 519. 

Representati vea from. NC.A. were very cooperative in showing ASA representatives anything they indicated an interest in. 

Recommendation and/or action taken· 

SIS-SC Form No. 1475 

(Rev) 15 Mar 45 

John ~ tht 1st Lt 

Name • ' Rank ' . 

Branch Section