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1. AS-80 AS-81 15 Dec 47 Storing of Cryptographic Devices and Materials 

1. It is believed advisable that a project be initiated to be undertaken by 

CSGAS-83 concerning .future methods of storing cryptographic devices and materials 

by low echelon units. 

2. Considering such devices as the WC-519, 508 and 507 1 wherein weight and 

· size are the daninant factors, it is necessary to revise our present •security 

regulations as to the association of docunents and devices, or to revise our 

method of storage. It is a certainty that no such device similar to the Chest 

CH-76 can be provided for low echelon units. The Air Force considers that the 

Chest CH-76 does not possess sufficient weight to pre.vent its being carried away 

manually. To lighten this safe would be a step in the wong direction. 

3. Consideration should be given to the inclusion of reserve rotors and 

documents within the outer carrying case of the device, with a method of quick 

and thorough destruction. Also to be considered is the provision of a lightweight inflammable safe, with a suitable lock provided with a quick and thorough 

means of destruction, wherein the necessary amount of cryptographic material 

might be stored. This of course would not provide actual physical security, yet 

would insure a certain degree o'f privacy. It is thought necessary that amed 

guards supply the factor necessary for physical security in low echelon devices. 

4. If present plans are successful. for constructing cryptographic equipments so that they are self destroying, it should not be necessary tb"1Provide 

safes for the~e devices in 1ow echelon units. 

5. Consideration might also be ,given to the removal of the cryptographic 

unit of the MX-519 with storage in the magnesium safe. 

6. Considerable thought will be necessary as to the most feasible and practical method consistent with the requirements for tactical use, as well as our 

own security policy. 

7. This' project should be undertaken at once as it is vi tally necessary 

that some plan be adopted prior to procurement of any rutum equipments. 

/s/ William Brann 

/t/ WILLIAM BRANN 

Chief, Technical Staff 

Security Division 

Extension 388 

['o~JFIDEr1 I IA0 

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Declassified and approved for release by NSA on 06-03-2014 pursuant to E.O. 1352e 
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1. 'lh9re an t.o ,_,,,,_,tal abJeo\lne to M reaebacl 117 OUI" pbplcal eeovJ. tf' Npla\S.au and b7 tba materS.al• • luua '° proYide thia 1eour1t7. !1ieJ 

.,., - --

a. PivtecUGD-aaiaat. torolbla eelaun 1uola u U. ... ..-.rmmllta et a 

untoaenter b7 ....,. ~. • : I \ ._ • '1"'t'!! f' ~ .. "o!.4 .. "1.-• 

b. Protect.1oa qaJna tr claodest.lne eeinra tar a ,briit period ot ;~, 

pumitting •DU7 apn\e to exa1ne equipment, cop7 •11.1.rc &grau, b7 Ua\ti 

ete. this latter protecU0111a p1Wabq mol9 mcesaa17 than Va tJ.rat, eiaoe ..- oeaaf\al eaplcmap ot tbe '1pe dNcr1becl 111.U umlll' DO\ be diaoO'ftlnld. 

2. Ifr can be pnenlJT atatecl that. con'81Dpl&W 1Bna ot elpber eqv.ipmaD' 

ls al.80 divialble Sato taro cla•-• 1s•• to tacUoal, eare or 1ua mob118 unite 

and la•• ~ addniatn.U.'181 ldgbar ecbel.ol\1 awe •;Jue •ftxad• org&Dlsat.t.GD1. 

' ~ J. JloU&hl7 U. d1v1a1m b7 acbalcm and diviaiaa or ph.yaical aecrurity ob- ~ JectlYea a\oh. Prataotlm apinat. eap1omge can aenerall)r be ea1d to be the 

p&19loant. oonsidera\lon in t.ba JdabeJ' headquarte:ra, pnt.ection apinat. 1oaa tJlrough 

t ~ Tlolat ao\ion ot pr!m8 !llportance 111. the lonr ecmlou. 

~ ~ la. To a cert.Cl1n decree, alao, dirterent. protective measure• ow\ to take 

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\ 

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cant ot tbe ditterent obJoeUvea. Sec111"8 storage 11pace 11 a deten&e against 

olandeat1ne canprad.aeJ a rapid aeans of t.otal destruction ot eq11ipaent u the 

log!oal deteme aca"•' oca~ b7 capture. 
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2. AG-61 AS-63 27 Sep L8 Storing ot Ceypt.ographic ,r.eonces and llateriale (Gcmt•d) 

a. All equiimnt.. cipher cc:mponenta, rotors, keJ lists, etc., •ill~ 

cade ot alt de1truct1bla material without regard to its contemplrlt.ed iseua. (AD 

uQBptica to this 1>1"DYD1on can be r.ade U an itc o£ equilJllent. 1a or 8\1Ch a nature 

u to poaitively preclude 1 tA ue in low echelons or it• shipmen~ under condit.tcna 

ot'aubjection to capture.) 

b. A llllall.1 lid>twe16ht, ·aelt-dettructible 1a!e nil be dewloped tor 

issue to low echelon UUitlJ. The aii.1"e iiill lie usea for etorage ot reserve material, 

rotont,. aucu:-ients, etc. Cr'Jptoqaphic un.1.ts of machine& tba.ael'Vea ma7 alao be 

at.orud :1n tbe oaies, when aucb un1ts a-"'C det&cbabl.B. 

c. lrl aa.~itJ.cm to the abaVe, .£1'?.ed ~uar\la -.ill be requl.red. Thia ia cana1d8:ed neceusar; for two reaaClll8 • . (1) 'lo pemit a time dela;r for igniting the equ1pnent. and the safe. 

(2) !o prawn\. capture b'J e11&7 •P.Y act.i.vit,y or the eat• wbieb •iU 

be ~t. 1n •febt, and portable. It 1a us~d tiat the normal 

cr-,rptograpbic caaplment w1ll be able to tw.tiU thl.a nqulrement without U. use or especiallJ' asa1gned. gU&l"da. 

d. at. th& h1uher echll.ona, beaV aecure Ates will be provided. (The 

CH-76 or an 1np1"0Yelll8nt on the CH-761 sboultl ""1; tib1I req,uireaant.) 3torae.111 

theze!n of •1P~rapb1c material, including cipher units when detachable, wU1 be 

undato17. Since tbese 1a1"U "1.ll not be aelt-m•tru.ctible it. may be neceaaar_y to 

pro'd.de sme sort of an 1ncandiarr t.o ignite t.be equiraent wlde, allot 11hlch 

will be alt deatruct1bl.e. - •· Current stn!am iJby81cal aecurit,. requ1Nlllenta tor f1Xad 1n•t.an.t4DD• 

will l941n 1n torce. 

l-'Rri.h"l c • .1iUS?Ut 

Ch1ef, »ethoda Branch 

bxtenaim 261 

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