-eeNr~DENTIAl REF ID:A58758 

:r. T. 'Leaey 

AFSA.-343 

~'Ugll.St 31, 1951 

f 

CRYPTAlTALYTIC Slr:lVBY OF MODIFI~;) H.~o.:rznr DEVI<m 

;t. INTRODUCTION 

A netrly developed cipher machine has been examined to determine possible cryptanalytic procedures that should be followed in case this ma,.. 

chine is employed by other countries. This ·machine is a modification of 

the:M-209 (or equivalent) tba.t is nov widely used, commonly called the 

Hagel in .• 

II. !>ESORIPTION . 

As the reader is undoubtedly familiar '11th the present Hagelin device~ it will be simplest to state the differences and modificatlcns incerporated into the new·machine. 

A. Relatively unimpol"tant changes. 

1 .. There a;-e 30 slide bars instead of 27 (or 29). 

2 .. The machine cannot be spun back to a previous vindew setting. 

3. ln the earlier inaehine, the rule: P (plain)+ C (Cipher) • 

IC (ki~) + S (slide) has been replaced by: P +- 0 = (30-K)i"S~ 

4. The sizes of the wheels have been increased from 17~ 19, 21, 

23, 25, 26 to 29, 31, 33, 34, 35, 37, which in each case are 

relatively prime. 

B. !.mportaat changes •. 

1. · 'rhe wheels do not take emctly one step bet'!.reen. eneipherments, 

bu.\ may take ( i-n.dependentl;y) a:ny number f'rom 0 to· 5 .steps. · 

2. Each bar is provided with five rather. than two lugs. These 

lugs ~re raised fr.om a fixed location rather than alid to 

Declassified and approved for release by NSA on 08-06-2014 pursuantto E.O. 1352a 

_ l'_ 
8~-36/50 USC 3605 

3. 3 (h) (2) 

RE.r- ID :A58758 

~ i 

.. " 

-·~ : .• ;: ~ ~ .. :~.;.~ .\ 1.:. .. ..... ··. 

tbeil' proper S}>Ot as iii the present D1a.Chine6 AJ11': or all 

of the 5 lUi:s izidi ~e t~lMed ib ilh ~c~ive pbjltioni but 

it is assumed that at least one lug will be used on eveey 

(or nearly everJ')bar. 

The irregular steppi.Dg of the wheels is effected as 

follows: Five of the bars are assigned to each wheel, 

bars 1-5 to wheel l, bars. 6-10 to wheel 2, etc.. Opposite 

the wheel to which the bar is assigned !s a. notch instead 

of what could have been a sixth lug·.. Of the five notches 

as~igned to each wheel, each of four caue the wheel to 

step one if its ~ar !s activated (slid to the left), and 

the fifth causes the ,.,heel "to step one if its bar is not 

activated• b bars are activated in the same manner as 

at present: an active lug opposite a.n active peg. (A 

new _arrangement enables tho active. and ina.cti'f"e pegs at 

the start of the c7cle to :retain their initial status, 

even though the wheels are being stepped to new positions.) 

III OYCL'.E L!:t!GTBs A?rn RUTS 

-a-. OORFIDID!TIAL 
-Ge~flBE~l~M: ~911i'!BllHI:Ali 

.;-- .. -·~ -· . 

• ;,.. . _;.t ,,j ~ ~-

- REF ID:A5~758 e = •• 

-·3 -· 

PL 86-36/50 USC 3605 

EO 3.3(h) (2) 
'· 

CONFl6E~Tl&L 

REF ID:A58758 e PL 86-36/50 USC 3605 

EO 3.3(h) (2) 
CONFIDENTIAL e 

®DUJ!IJJIRI' ,, 

FIG. I (cont.) 

. 

REF ' ID:A58758 

-5-

~L 86-36/50 USC 3605 

E03.3(h)(2) 

. 

-tellf-iBc~Tl,~t 
ODNFIBENTIAl 

QQii'Ullo!HU. 

REF ID:A58758 

.. ~ .. --. -

PL 6-36/50 u:c 3605 

EO . 3 (h) (2) 

CONFIDENTIAL . 
REF ID:A58758 

PL 6-36/ 50 US( 3605 

EO . 3 (h) (2) 

-7-
.. :&:Ill A REF ID:A58758 

CONFIDEN I RI. -

.. _ 8. 

PL B6-36/50 USC ~605 

EO 3 .. 3 ( h) ( 2 ) 

Qffi""I;plH!1 
CONFIDENTIAL 9 

' '· REF'.ID :A58758 

- 9 -

PL 86-36/50 USC 3605 

EO 3.3(h) (2) 

··•S