•MEMO• ROUTING SLIP 

DATE COORDINA3 

4 

DD I ~W-110 9 4 REPLACES NME FORM N, 1 FEB 49, WHICH MAY BE USED. 

TION 

FILE 

INFORMATION 

NECESSARY 

ACTION 

llDTEAND 

REl'URN 

SEE ME 

SIGNATURE 

TELEPHONE 

:Ill ..... ···* 

roved for Release b NSA on 05-13-2014 ursuant to E.O. 1352 
I a,--•-..... e REF ID:A58056 

NATI<llAL SPJltJlllTI AG~fCY 

W&sh.1.ngton 251 D. Ce 

.. 

24 Roveaber 1953 

OFFICE OP CtH!UNICATION SECUBlTI DIREC'l'IVE NO. 4'-120-.5 

SUBJ.ECT1 Gu1d.ance on Regrading of RESTRICTED Jfater:lal 

Reterencea D/F .from AG dated 20 Nov S31 Sllbj: Presidential Order 

Attecting Security Clasaitication 

1. Purpose. - The purpose ot this directive ia to provide 

guidance within the ottice ot cozmam1cati0n Secur.l.t)r conceming the 

:regrading of RESTRICTm> mter1al. tor which th18 Office is reaponaible. Further guidance will be P11bl1shec:l as app.ropl'iate. 

a. Ettective :lm:Decliataly, the claas1.tication "BESTRIC'.l'ED1

• 

sball not be used on M7 material originated b,y the o.ffice ot coma 

Jlllllication Security. 

bo Etf'ective 15 December 195.31 the statement 11Securit7 

Intonation·• shall not be used. 

(1) 'J.'he statement nee:l not be deleted born documents 

now urd.er preparation :tt those documents are beJODi 

the mckup stage even though distribution cannot be 

llBde prior to 15 December. 

(2) The statement shall not be inclmecl on documents 

which have not pa.t!Sed the mockup stage in preparation. 

c. fublicationg. 

(1) Hach Division am Group 8hall nake a list ot all 

RESTRICTED publlcaM.ona now in preparation. This 

list shall be submitted to ~s & Evaluation 

Div1sion tor review am :reclassitication. An imication o£ priority should be made on tho list showing 

those items which azie scheduled tor production within 

the next. t1t0 weeks in ol'd.er that they DJB¥ receive 

first attention 1n re'Viewo 
e REF ID:A58056 e 

24 Kov•ber 1953 

OFFICE OF C<J.!MUUICATION SECURI'l'Y DIRF.CTIVE ao. 4,-120-5 

(2) ~TBICTED piblle&tions which have already been 

completed shall be reviewed b;y Ar1alyais & Evaluation Division tor determination ot regrading in 

accordance with the standards outlined 1n paragraph 3 bel.owo 

do EgF.ppente 

{l) Analysis & Evaluation Diviaion 8hall review all 

RESmICTED Ca45.EC equipnant and ahal.l determine 

whether it requires regmding to COUFIDEtfl'IAL or 

UnclassU'iede Analysis & Evaluation Division will 

adv.tee Planning Group as soon u this determination 

is Dl&de in order that appropriate action may be 

taken in regard to replacmrent ot nameplates. Anal3Bis & Evaluation Division is responsible tor 

promn] gation ot regrading intonation to hold.era 

pertaining to RFS!'RICTED equipmnts am will normJ.11' 

do so v:la the madilml of changes to operating instructions tor those equipnents. 

(2) Cont3ct1. - Each contract umv c/sm cognisance which involves RESTRICTED equipmnt. components. 

parts, etc., shell be subject to imividual review 

by the PlannirJg Group froject Coordinator concernedo 

{a) The Security Requirements Check List shall be 

used tor this ~ew. The RESTRICTED column in 

these check lists shall be examined am. each 

RESmICTED item shall be regraded on the basis of 

the guide provided in paragraph Jo 

(b) All doubtful. items 9ball be eBl'mU'kecl as well aa 

items tor which a regrading to CONFIDE:1TIAL will 

1ead to serious contra.ctural dilticultiea d.1,1.e to 

the clearances or facilities of the contractor 

involved.o 

( c) Analyais & Evaluation Diviaion will review the 

Plann1ng Group decisions giving special attention 

to 88l"2I8l"k6d. itans ani performing coordination 

with Planning Group am other Divisions as neceaaary during tha reeolution oL each particular caseo 

2 
e REF ID:A58056 • 

24 lC'oveaber 1953 

OFFICE or C<».tMIJNICATION SECURITI DIRECTIVE NO. 4-l.2o-5 

(d) As regrading or particular RF.81.tUCTED contracts 

is COD;lleted, Pl.arming Group shall promulgate 

the information to contractors concerneii and 

8hall 1n1'orm them. of their responsibilities to 

regrade the items concerned ~ any lmS'l'RICTlW 

correspondence pertaining to those itamso 

90 Corrf!pon:iengeo - Each Div.lei.on am Group is responsible 

for the review oZ all .BESTRICTED correspomence originated by that 

Diviaion or Group aDi shall regrade each item either COlWIDENTIAL or 

UnclassUiecl on the basis ot the gu.ide provided in paragraph Jo During 

the review, the «>!T8sponience 8haJ.l be IJf:lllB.r&.ted into two categorieathose which are :regradec:l COOFIDENTIA.L and those which are declaes1.tied.o 

A listing ot each category ahal.l be made, first by CClllIOn addressees, 

arx1 chronologicall.7 within each coranon addressee grouping. These lists 

shall be aruhnittecl to the AGo (The AG 1d.ll collate these lists with 

those received tram. other NSA organizations ani will pJ!'CIDUlgate the regmcling intormationo) 

to J!Msageao - Bach Division am Group 1a responsible tor a 

review ot all RESTR.!CTED messages originated _by that DiYision or Groupo 

The procedure to be followed is simi Jar to that outlined. tot" the 

hmU1ng ot RESTRICTED correspondence except that d&te-timlJ groups are 

to be used in the chronological listings. 

NOTE1 Whenever ~ massage is declasaitiec:l, the declassification procedures Olltllnad in AFSAG 1210A. &rd elsewhere are to be tollowecl maticul~o 

.30 flu1d.e !2 BMt"!#ni• - The basic principle to be .toll.owed in 

regrading RF.STRICTED matter pertaining to cnJ>togra.phic systems is as 

tollowsa It the 1ntormation does pertain directq to cryptographic 

natters aDd. U a real juatitication uisted tor its having been claa--

Bitied orig1naJ.l¥, 1ihe neecl for protection is not altered. am upgrading 

to CONFIDFlrl'IAL 1a required unless the original situation has changeclo 

Since the collection of' intelligence is eJCpensive and laborious even 

when onlJr ndn1mum security protection is given to the intOl"Jlation 

sought, ju&tif'ication for declassif'ication cannot be Dade on the basis 

of "comnon knowledge" or possib1e availability of the :inf'orma.tion elsewhere. Nor is ncontractural expa:lience•' a valid justi.t'ication tor decla8-

aiticat1on. .Declassitication may not be mde simpl,y because the :lntorn:ation :ls ditticult to protect or because its protection heretofore ma.y 

have been inadequate. Below are listed specific categories ot RES'DllCTED 
e REF ID:A58056 • 

24 Bovem.ber 1953 

OFFICE OF C<IHRIICATIOU SECURI'l'I DIRECTIVE UOo 4-120-5 

intormtion which require upgrading to CORFIDENTIAL as well as those 

which mqr be declassi.tieclo It should be noted that all material J."e<-

graded C<llP'IDENTIAL ;l.mnediate~ becomes subject to the han:lllng require- . 

.menta tar aterial. ot that classificationo 'When a BES'DUCTED registered 

item ia declaaaitied.1 11; can no longer be regiatered.o Ii' it appe&l'S 

desirable, it~ be cop,-mmbered to .facilitate local accountingo 

ao Wi!STRICTED ingorg.tio,n requiring p.pgmclingo 

(1) Intonation 'Which ll8JT lead directly to the e»-

ploitation 0£ one or mre cm>tos78'tems whether 

current, planned, or 1n use within the past 5 yearso 

Thia incl.mess 

(a) Any material specit:lcally related to a particular 

ceyptosyatez:i. when the rel&tionship is shown in the 

publication, correspondence, or message being regradeclo RESTRICTED compomnts or 'elements 

employed in a particular cl'7Pfio-equipnent require 

upgrading 'Whenever their relationship to the 

equipmnt 1a indicated. Specitic cr.n>toproceclures 

classified BF.STRICTED require upgnding U the 

equipllents or s,ystema emplo71Dg them are identi.tieclo 

(b) Arrr naterial or intoia.tion which tends to reveal 

unknown features or principles emWied in c17J*.os;rstema. 

( c) Arly' intozma.tion revealing the principle ot ~ 

sped.tic cryptosystem it the identity- ot the 

particular cr;yptoaystem is alao revealed.. 

(2) Acy information pertaining to Cammmications Intelligence. 

(3) Information ot eut.ticient detail to reveal the C/SF£ 

mission ard. tunction of the National Security Agency 

except in the moat general terms. 

(a) In its broad outlines, the mission ot this Agency is 

considered Uncl.aasit:l.ecl. 

(b) Whenever any indication ot scope is made; e.go• 

number ot personnel, number ot equipmnts, overall 

coat ot programs, details ot the relationship 

between this an:l other Agencies, organizational 

charts, etc •• a m1n:Snnn classitication ot CONFI• 

DEN'lIAL is requirecl. 

4 
,r', 

t - e REF ID:A58056 • 24 1'ovember 1953 

OFFICE OF CCl!MUNICATION SECUBITI DIRF£TIVE NO. 4-120-.5 

(4) Intorma.tion ot sut.ticient detail to permit association ot mtual. holders ot particular cr;yptoayatems. 

b. RESTRICTED intonation which m RI dec1assifiest: 

(1) Documents, correspomence, and messages pertaining 

to abaDionecl projects. 

(2) Intomation pert.-Jn1ng to cr,pt.olQ'Btama vhich haw 

been obsolete or detunct tor 5 or more )'98.r&• 

(3) Parts llats not identiti«l with particular cr,nttoequipmnts. 

(4) Admfnistrative instructions and proceclurea. 

(5) Personnel actionso 

c. The toll.owing .regradinga &bow e:x:ampl •s o£ .impl.wnt.a.tion of 

this policy& 

(l) Upgtaded to CONFIIlE?f.L'IAL 

(a) RESTRICTED lists of CJ"1Ptoholdings. 

(b) AFSAH 7/11 AFS.\M 499• 

( c) Operating Instru.ction8 £or AFSAM 1+99, tor AFSAM 360 

(2) Downgrada:l to Unclase~tied 

(a) Inlin.dual short; titles transmitted by an:r means 

(unless linked b.r long ti.tle or other means to the 

nater:lal to which they pertain)o 

(b) The Cryptographic F.quipmnt Parts Catalogo 

(c) RESTBICTED elements ot SIGFO!' (Connrter M-325) 

ard. RES'l'RICT.ED publications, correspomence, am 

maaaagea perta1n'1?lg tharetoo 

(d) APSAM lOOo 

4• AffT questions regarding implementation of this policy or requests tar aseistance in its interpretation JJa1' be retarNd to ~ia 

5 
~ . ', ·' . e REF- ID:A58056 

24 • November 1953 

OFF'!CE OF COtDWNICATION SECURITI DIREC'l'IVE rm. 4-120-5 

& Evaluation Division. An:r BES'l'RICTED int01"JJBtion which does not 

appear to tall umer any ot the categories ird.icatecl in foregoing 

paragraphs mQ" also be reterred to ~s & Evaluation Division tor 

assistance in regrading. 

DISTRIBU'l'IOO: 

AG, R/D, LOO (2 each) c/rux;, 401, 403 (l each) 

402 (2) 

4l 42 ~5) 12) 

~s>!) 

PROD 

6 

F • • IIERRELKO 

~L,~ Colonel, u. So Air Force 

Aasiataut Director, 

Comrunication Securit.7 

..