TO oar E DATE 23 Jan 52 

FROM 412 

SUBJECT Forwarding of Report 

The following report is forwarded for ~ 

AFSA-412B'l-1550.2, "Reoo'liiia:!~~~ 

1000 Characters in Length o 

Messages". 

11 Machine Variables From Two Messages 

ith One Cylinder Offset Between the 

R. B. SHAW 

Head , AFSA-412 

\ 

Declassified and approved for release by NSA on 07-11-2014 pursuant to E .0. 1352a 

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. f.OP:;: SfCRE~ REF ID:A58738 

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AFSA-412B2•1550.2 

6 Bovem'ber 1951 

REOONS'l'ROCTI°OH OF ALL MACHIHE. VAlUABLES FR~! ~O UESSAGBS, 1000 CBAbCTERS Ilf. 

LD<1tH OB TELF.CRYPl'O WITH ONE ClLINDER OFFSE'f° BETWEEN 'fHE DSSAGES· 

I. S~ 

l. Ratarenceru 

a. Letter tZ'Olll B. Hagelin to :Ur. w. F. Friedman, dated 21 May 61 .. 

b. AFSA-412B Memorandum.,, "Brief' Seouri ty E.stimate of Telemoypto", dated 

15 Juno 61~ 

Oo AFSM12B2 ... 1550o 1. 

2.o Purpo101 To ntQonatruct all maoh~.ne var1ableeo · 

:s. ·Given: . 

. a. two· messages, 1000 oharaotera in length enoi:phered on '?ele~rypto. S~ttinga 

ot all ftl"iables are the aama tor both m~asages,, except for the setting ot one 

oylimer. 

b. KD01r1edge ot tbs machine~ inoluding the lootition of the t'i•d stepping teeth on the drm, 

4.. Results: 

ao · fhe two messages aro read and ·key reoo:nred. 

'b. Al). machine variables a:re reoonatl"lloted. 

RL 86-36/50 USC 3605 

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PL 86-36/50 USC 3605 

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PL 86-36/50 USC 3605 

EO 3.3(h) (2) 
REF ID:A5873Be ~L 86 _ 3 6/50 use 3605 

EO 3 . 3 ( h) ( 2 ) 

ARALYSIS BY: 

ci>aephine Wagoner· 

Doris Doming 

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REF ID :"A58738 

PL 86-36/50 USC 3605 

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REF ID: A58 7·3a 

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3. 3 (h) (2) 

PL 6-36/50 USC 3605 

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'TOP SECR REF ID:A58738 

PL 86 36/50 USC 3605 

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PL 6-36/50 USC 3605 

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PL 36-3 /50 USC 3605 

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REF ID:A58'138. 

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