~~ -~.REF ~55 ~ ARLllJGTO?J HALL STllfON 

TO 

Date~ 

~ 

/ Commanding Officer ----/Asst. CollJl!landant -------- -v-Di.r. ot Com. Res_e_ar_c..,.h _____ _ 

Executive Officer -A.sst. Executive O.,,f""f"'"ic_e_r___ _ 

Adjutant -Asst. Ad .... j-utari......,_t _________ _ 

-Chief, Headquarters Branch 

-Coordination Section' ----

Inf. and Liaison Section ---- -------- Chief, '" Branch ----Ch 1 e f, B Branch ---------------- -Chief, C Branch----------

_ Chief, D Branch ________ _ 

Chief, E Branch ---- -Dir. Chief, of F Trainin_g Branch ----------- ___________ _ 

2d Sig. Serv. Bn. 

----Property Officer ----------

----Personnel Officer 

-Provost Marshal --------

Post Engineer ----Clasaified?la~ipl-Ro=-o-m _________ _ 

----Secretary to c. o. 

-General Files --------

201 Files -- ---------------- Comments and Return 

-Recommendations -------

-Informaiion 

Information --------------- and Return ---Inf. and Ji'orwarding ------- ~Your Information an...,.d-F"'""i""'l_e ____ _ 

-Signature, if approved 

-see Note on Ba.ck --------

As Requested -~s Discussed---------------

Your Action 

---~~·~ --------------

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{ · ·-...--.c~ .!REF ID :.ia6855 . ... • ' ArJ...INGTOIJ ~~ STA.TIOll 

~ Date b.Jo....'f"f 

TO / VlbUllUD~ FROM 

V- Com.'118.llding Officer ' 1 

--.1\.sst. Commandant/ 

-Dir. of Com. Ire search V 

-Executive Officer 

Asst. Executive O"""f...,.fi. .... c_e_r ____ _ 

-Ad,Jutant 

·~Asst. Ad-JU_t_an__,t,__ _______ _ 

-Chief, Headquarters BranCh 

Coordination Section ----

-Inf. and Liaison Section 

-Chief, A Branch ----- ==Cl!ief, B !3ranch ________ _ Chief, C Branch ________ _ 

-Chief, D Branch 

Chief, E Branch ----------- -Chief, F Branch---------

-Dir. of Training , ......,. ________ _ 

2d Sig. Serv. Bn. ----Property Officer --------- -Personnel Off ice_r ________ _ 

Provost 14arshal ---Post Engineer -----~-----

-----Classified Ilal._l.,....,R_oo_m----~----

-Secretary to C. o. 

General Files -------

---201 l!"iles 

Comments and Return 

-RecOI!ll'lenda'bons -------

Information ---Information ------...-------- and Return 

-----Inf. and rorwarchng -------

Your Information and File ----Signature, if approved ____ ------_ 

-See ?Jote on Ba.ck · , -~_-.¥"Requested --------

~.i..s Discussed 

-Your Jlction ----------

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HEADQUARTERS ARLINGTON HALL STATION 

OFFICE OF THE CoMMANDING OFFICER 

ARLINGTON VA 

8 Januar7 1944 

Dear Cadr. Derm1atonz 

Friedman haa suggested a tJ'Pe ot atud7 which might be 

highl7 usetul even though it would have to be recognized that it would obviousl7 involve a good deal ot guesswork. Ma7be 7ou have all'ead7 made such a atudJ' and it so, we would · be ver7 appreciative ot receiving a COPJ'. It 7ou haven't 1 we would be ver7 glad to collaborate with 7ou. The studJ' 

he proposes is aa tollows: 

The importance ot having detinite intormation as to what 

the Germans and Japanese are reacl1ng ot the diplomatic 17stems 

used b7 presentl7 neutral governments such as Turke7, Portugal and Spain, is obvious because ot the ettect it would have on 

our own diplomatic negotiations with those neutrals. Assuming that the Germans and Japanese are satisfied that we are not 

reading their high-grade s7stems, which seems a ve1!J' reasonable 

hJpothesis, and using this assumption as a guide or a measure 

ot the technical prowess ot their crJPtan&l7tic starts, vhich 

ot the cryptographic s7atema used b7 the foreign otticea ot 

the currentl7 neutral gover1JJ1•nt8 could the7 be expected to 

read? Which ~ the7 certain17 reading? Which are the7 proba.bl7 reading? And so on. Such a stud.J' would, ot course, have to 

be correlated vith data as to the extent and sources ot raw 

material available to themJ tor example, it would be clear 

that trattic sent b7 land lines or cable and not within their 

ph7sical reach would not constitute source material tor them. 

Ot course, Ye do have a small amount ot intormation on 

this subject, gleaned trom reading certain German and Japanese 

messages. It the data vere all assembled and evaluated the7 

might make a good b&sia tor elaborating on the subject which 

Friedman. auggeata. I would be ver7 glad to have 7our comments 

on the foregoing. 

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Sincerel7, 

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