·. 

'l9P SIG9RE'l' 

e REF ID:A59527 

DEPARTMENT OF Tim NAVY 

OFFICE OF Tim CHIEF OF :tJAVAL O~RAT!ONS 

HASHINGTON 25, D.iOoSEetfft?'ff Bfti\9RMA:i'I6N HP SECRET 

MEr·llRANDUk Sccartt, WaamJou 

From1 Chief ot Naval Operations 

'l'o: Joint Chiefs or statr 

• 1 

S11bj: JCS 2U/4/22; Repla.csnent or the Combined Cipher Maahtne 

Enc1s (1) Draft Memorandum 

'1. !l.'he Chief' of' Naval Operations agrees tdth the urgency of decid!ng 

on a o17Ptopr:1.nciple to replace the present CCM cryptaprinclple b1l'ta 

does not agree ·with the J>?'Oposal that ADONIS be recommended to the • 

Representat.ives of' the British Chief's ot start as made by tbe 1)1rector, 

National Seourity ~ency in his Memoratldum of 23 December 1952 contained in JCS 2074/22 nor in the Draft Uemorandmn attached themto .. 

2. The ChiGt of' Naval Operations pl"Oposes instead to honor e:rlsting 

agreements for the introduction ot BRUTUS as the new Combined U. S .f 

u. K. and NATO cryptoprincipl.e and reoommends substitution ot" the 

Draft Uamarandum enclosed herewith as the repl;y to the Representatives 

e£ the British Chiefs or Stal'10 

TIP SECIET 

Sa:t• "~ft 

Declassified and approved for release by NSA on 01-28-2014 pursuantto E.O. 1352a 

COP! # OF 40 COPIES ' -
REF ID:A59527 

'A>P 8Ei6HJR 

SBfJURl'f'Y !lf fi'OftUAftOlf 

TIP IEllET 

Seeuntr """-tt0ttE 1'1 C I, 0 S U R !~ .... ~ .. ,. ..... ..,. ..... ::.::. ....... "--

HDl>RAlfDWt FOR m 1"~¥:.l~mfl-OF THE Bf!}j'l§.t!J!-IRi,m QF St.Alf. 

Subjects Repl.acem.ent of the Combined Cipher Machine 

1. 'fhe United States Joint Obie.ts ot Statt concur with the views expressed 

by the United Kingdom Chiefs of Statt in Ar:? 96, dated 5 Dectr.tber 19521 

concetrd.ng the adoption ot the BR1JTUS cryptoprinciple as the new combined 

U.K./U.S. and NATO cipher SJ'Stem. 

2. The United States Joint Chiets of Statt agree as to the urgency and 

importance in reaching agreement on this problem. Further delaJ'S can be 

aTOided b7 our making a tirm and f'inal decision as to the cr.vptoprinc:l:ple 

to be employed in the net., Combined Cipher Machine• This will then permit • 

our respective technical organizations to take rapid, concerted and 

a:!multaneous action to obtain the equiJJDents which embo~ the a~ed 

principle. AccordingJ.7, in light ot the lack of. adequate service tests 

for the POLUJX ceyptoprinciple, and the need tor a decision at this time 

based on known tacts and proven principles, the u. So Joint Chiefs ot start 

propose that1 

a. The cl7P"toprinciple BRU'l'US• as heretofore agreed upon, b& designated 

aa the new Combined and NA'ro cipher systam. 

b. The United Kingdam and United States jointl.7 prepare a :plan f'or 

introduction ot BRUTUS to begin on 1 Janua1"7 19550 

c. 11'1u1 u. s. make available to the u. K., under arrangements to be 

determined later, u. s. BRUTUS equipnents required in excess ot modified 

existing machines until such time as the u. R'. can provide tor its own 

version ot BRUTUSo 

d. The incorporation of a plutr.gable ottt'f'Ut be investigated and that 

this highly desirable feature be provided when practicable. 

3. It is realized that introduction or BRUTUS will involve adaption or manJ" 

10-15 79ar old machines tor the ERUTUS principle. It is,, how-ever, emisioned 

that these equiJlnents will be replaced as rapidl.y as possible 1 but that thq 

willt 
REF ID:A59527 

-

'1reP SBeRE'! 

&GYBtR' 1N¥QRU!:'i'I9N 

hP SECIEi 

Secur1t, ltfuaatfcwa 

a. Provide a backlog ot equipnents ror NA'l'O use. 

b. Represent etandby equipnents tor use in the event or hoatilitieao 

4. The u. s. Chiefs ot Statr consider the potential reserve value ot the 

OOM (CSP 1700) ot sutticient magnitude to anbark on a program of modem:!.-

zation ot these machines to provide BRUTUS operation. '!'he tea.sibilit7 ot 

euch a modification has been proven (AFSAM 48) and phased conversion w:f.11 

be accomplished as new BRUTUS machines are introduced and CCMs became 

available. 

s. It is theretore urged thai 10u accept tho pro-poaals contained herein . and that 70u inform. us ot your acceptance as quickq as "POBsib1e,, 

Enc lo SUN 

TIP SECRET 

$ea It)' lnfcnn1t1otw