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WDGSS-60 

~UARTERS 

ARMY SECURITY AGENCY 

Office of the Assistant Chief, Operations 

DISTRIBUTI )!; .i.$ EIDIC 1.TED 

I. DEFI~HTIO?l ..Um .\PPLICd\TION OF TOP SI:CR::T CREAll 

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I- \~ ~ _ -:-1 J1;rk1t, 

21 Ha.ruh 1946 . } 

/(if-/ 

2 

The following explanatory m:itter pertaining to the def:;,.ni ~;ion and 

application of TOP SECRET C~ is furnished for your inform.atjon and 

guidance: 

1. It may be noted that TOP SZCR...;T OP.EA!: indi.catoo both the cla.sqlfication and the category or material so st~ped. CR3.\.?! actu~Jly denotes a category or intelligence. Therefore the following directions 

for the application or TOF SECru:::T CRE..Jl ~re b4sed on ?rocedureL necessary 

to protect the intelligence itself. or necessity thoy concorn some of' 

the processes involved in its prep4ration. 

2. Signal Intelligence (Ccm.rnunicatlon Intelligenca). ill intelligence derived l'rom. the study or rJ.dio transmissions and other to:mnunicatlons is known as ccm..:unication intelligence. It conslsts or t-wo categories a 

a. Special Intdllig~noe. 'i'hu.t sign.i.l intallig.:ince w~.ioh rosul ts 

from the decryption or th.> texts or substance of' encrypted aomnunica.tions 

constitutes Special Intelligence. This category of' int~lligance is TOP 

S3CRET and is designated as CRZ..\H. 

~ ,

1 b. Traffic Intollie;en'le. That signal intolliGence wl-.ich is l

'li: Jq ·\. f-1( obtain~d f'r'JJD. intercepted cor.mrunications by all means short of decryption 

f\- constitutus Traffic Intelligo~co; This category of int~lligenco is 

"'f'l:~ . SECR!JT and, subsequont to e.groe~ont e.t the presont Confc..rencd, will be 

I r j \__ designated a.s IVORY. 

~ ·I 3. TOP SECRET CRE.\.M. Thoso materials which cons Iii tuto TC•? Si!:CRET ~ "t' CREaJI and the oondi tions under which they must bo:1 so stn."!lpod ai·e as 

("- follows: "" 

:fatarials 

(1) All papers cont~ining Spdcial 

Int~llig~nce. i.e., the product 

or duoryption (tr.:t.nslutions, tho 

.lhan St..tmpod 

At .a.11 ~imos. 

Declassified and approved for release by NSA on 09-19-2013 pursuantto E .0. 1352a 
r 

t 

REF ID:A718~ 

'!'Of' 9El9Ri3'f ';p; 

1IDGSS-60 (21 March 1946) 

lfu. te ri :il s 

3ullutin) ~nd the intelligence 

produced therefrom (the Diplomatic Summary, etc.). 

(2) All worksheets, records, devic~s. and equipment involved 

in the cryptanalytic and d~­

cryptographic procosses employed in the production of 

Speci~l I:itelligence. 

(3) All papars which include specific 

technic::i.l in£orD1D.tion t~ken from 

the materio.ls defined in (1) ~nd 

(2) above. 

( 4) •1.11 papers which make specific 

reference to the content, n::i.ture, 

or status of Speci~l Int~lligcncc 

o.nd/or the crypt~nalytic proc3ssos 

or materi1ls involved in its production. 

When Stamp·::id 

1."fuun made uvailab:cc 

outside the .;.gcnc:r or 

to Agency personn~l not 

engo.ged i:i commun·Lc::i.tion 

intallig~nca activlti3s. 

At all t 1-I'les. 

.-i.t all timo;:,s. 

I / 

1f1,tf'tf!Jt111 ~J ' HAROLD G. Ht\YES 

Colonel, Signal or9s 

Assistu.nt Chief, Oporations 

1 ea - Chief, Army Sec•1ri ty ,1g .. mcy 

1 ea · :~ssistant Chief, Staff 

1 ea - Director of Communicat~ons ResJarch 

1 ea - All Division Chiefs 

1 ca - Branch Chi~fs, Intelligonc0 Division 

2