. 

' 

t'Ot 

-"(_ 

A••1eant Ohi•t ot ltatt, 0-2,, and 

the Chtet 81gnal Ottioe:r 

Oonaan41111 General. A~ Be:rv1o• •o~oea 

1. The to11ow1Dg 1nto:rmat1on :relat1v• 'o United Btat••-

Oermaii, and. Japan••• aignal aecur1t7 equipment 1• tv:lliahed 

tore 1nolu•1on 1A !'•PlJ to ••orandum f'rom General lla.r1h&ll 

to General Somervell dated ' M&7 19~5. 

!. l:peech 8eov1t7 Kqu1pment1 ::;.~ 

a. V"' I. A'Z"llfl" - - B0-220-'f High aeov1 tJ eq·L11paent 

~ tor traneooeu1o telephonic oOllllllUD1ca tion on Bt&f'f' an·1 B1gh 

Oonman4 1e"Yela. 

Jcnovn. 

lmovn. 

b. Ger•n AJ!ll.1 and Air JPo:roe -- Bo comparab'le item 

ct. SY&luat1ona 

-i. 

(1) Jt0-220 ~· •o Jcnovn method or •olut1on1 no 

tn41cat1on ot OrJ'Ptan&lJ"tio atudJ' o:t- auooeaatul attaok b7 ene..,.. 

(I) !'he Japan••• have uaed 1ov-aecur1t7 •P••ch 

•4u1111ente to a 11111 ted eztent. Al:L fol'ma 

ba ve b••n aol ved b7 l1. a. A'nJ1 teohll1o1ana. 

eclassifi ed and a 
- -... ~ ... --- ... --.. - -

J. !e1•tJP• hcvit7 Squipmentr 

a. U. I. Anfl' -- Converter •-228 aJJ.4 B1Cl!O! 

•cutimen.t•. !be toneJ' 1• a l!ledium aeoUl'itJ, the l&t1;eJ' 

a high aecurit7 mech&n1•• tor automat1oall7 enciphering and 

dea1phe71ng t•l•tJPe'Vr1ter a1gn&l•, pel'll1tt1ng band.ling or 

la~g• volume• ot irattio b7 v1r• and ra.41.o. 

b. Oerman A.., and Air Poree -- •oehe1meobre1ber• 

eqUipaent. Similar 1n tunction to Oonftrter Jl-228. 

bovn. 

o. J'apan••• A%'lq a.nd Air Poro• -- •o compa:r&bl• it• 

4, Snl•t1ona 

(1) llIOTO'l' equilJl&*nta Ko known method or •olut1on1 

no 1n41oat1on or 017Ptanal7tio atud.7 or 

•ucc•••tul attack b7 enem;r. 

(2) Converter M-228 eqU1iaen'• Kethod11 or 

•olution &ppl1cabl• UD4er certain .,on41t1ons 

•i-• Jm.ovnJ no 1n41cat10n or orJPta•lJ't1o 

•tud.7 or •uco•••tul &ttaok b7 enemr. 

(') Oehe1maobreibftr1 •thod• or solution have 

been evolved, aJ0,1ed aucoeaetul.17, and a 

large &moUDt ot tl'Attio aolved b7 Br1t1ah, 

Vi th U. I. ArfA7 cooper& ti on and a1.s1ata.nce. 

Jbceptionall7 valuable 1ntall1genc1e obtained 

tram all high-•chelon oh&Dnel• on vh1oh it vaa 

11••4. 

'· 017J>tograpb1o lqllipment. 

& • V. &. l.J!llll 
-. 

REF ID:A72344 

(1) Oonveter K-1'-·Ga A'ke7board opa:rated, 

J»).91.nting cipher •chin• capable or eno1pher1Jlg meaeas•• ot all ol&aa1t1oat1ona at the 

rate or t1tt7 (50) word• per minute. Widel7 

41etr1buie4 to &11 large t1xe4 headquarter• and 

to headquarter• or taot1cal units dovn to and 

1.Aolud!ng d.1•1•1o.n hea&Jua.rters. 

(2) Converter a-2091 A ••ll, manm.117 operated, 

meob.an1cal printing cipher •oh1ne tor lov-

•ch•lon tactical oCllllllUD1oat1one. 

b. Oermn A.rrq and A1r :rorce1 "h.1s-" a1phe:r •oh1ne. 

A ke7boar4 operated. DOn·printing oipher machine v1th max1nwm 

apeed ot OJ*r&t1on 11Jll1ted to approx1•tel7 t1ve (5) vorda per 

ld.Jlut••· 

• 

o, .fa.pane•• Armr.and Air •oroea lfo ooaparabl• equip· 

•n.t. knovn to b• 1n ue although recent 1ntor.t1on 1nd1catea 

tb&t t;liere ia one under d.evelopaent. 'fh••• organisation• nov 

\tie ••i'f oaberaome .. paper and peno11• band uthode. 

4. Jvaluat1ona 

(1) Converter •-1,4-0a Ko knovn method or aolut1onJ 

.. 1nd1cat1on1 ot cr7ptanal7t1c attack bJ' German. 

vtth no aucoeaa Ybatever. 

(2) Converter K-2091 llethoda or attack under 

certain csond1t1ona are lmownJ 1nd1cat1on• or - . 

orntanal7t1c &ttaok bJ aor.na and Japanese,, 

v1th limited amount ot •uooeaa, due to iaproper 

u•• ot the dev1o• bJ certain UD1ta laoJd.ng c;;;-:ii 'f=', ~--·1 11 ~ 1

:"f.' w I - I • I• • 'l-, ,,, ., I It - I I I I ., I 
' ; 

/I 

I 

,l 

. . 

j 

/-

•f • , 

,' f; 

REF ID:A72344 

~tor ~ .. 

a.4equate tra1nln8 and auperv1•1on. 

(') "snipa" o1pb•r •oh1Ae1 Smplo7e4 to eno1pher 

highest level adllins.atrat1ve &nd ca..a.nd 

V&tt10. ..thoda ot aolu.t1on bl.ff t>een 

••olved and applied auco•••~ull.J' b7 Br1t1•h 

W1th oon•14ei-&ble •••1atanoe and 001>perat1on 

ham V. a. A:r1D7. A large v:olwae ot 1D.te111• 

pnoe ot h18h••t 1mportano• obtainecl from the 

auccea•tul reading o~ th1• tratt1c. 

(•) Japan••• orJPtograpb1c a7atema 1 •e1;hoda to'I! 

their aolut1on b&v• been eYolved and applied 

auoceaatul.17 b7 the 1J. I. bJq' v1 th the 

~••ultan.t pro4uot1on or a large vol\111e ot 

taportant 1nte111genoe.