\. 

' 

.. 

~-

J4..c~ ~~ ~~ ---L •. ~ 

/k- ~ ~ 
t .. •Sil • -~"' 

:JERIAL 

jQ. 

107,244 

~78,868 

~ 

\ I ' 

1. 

DATE FII.ED 

REF ,,W.jAY,lflMRt 

~u11r1utnr\ B. PElIDING APPLICATIONS 

INVENTOR(S) TITI.E 

25 July 1933 William F. Friedman Cryptographic System 

23 Oct 19}6 William F. Friedman Improvement in Crypto- graphs 

23 Mar 1936 William F. Friedman Cryptographs and Frank B. Rowlett 

i 

NATURE I 

The application involved in 

Converter M-134 and M-134A, 

the predecessor to Converter 

M-1340 (SIGABA}. Very important because it is the 

basic invention of electric 

control of a set of crypto- graphic rotors in cascade. 

Replacing the key tape control by a system of differential cam wheels with 

variable lug patterns. 

A set of cryptographic rotors 

in cascade, the angular. placements of which are controlled by another set of 

rotors. Basic invention 

in Converter M-134C (SIGABA}. 

6 Mar 1943 William F. Friedman System for Enciphering The basic invention in facFacsimile simile or telephoto encipherment by polarity reversal. 

12 Mar 1943 William F. Friedman System for Enciphering Variation of preceding and J. O. Mauborgne Facsimile application. 

CONFIBENTlftl 
~ .. -

SERIAL 

NO. 

551,172 -

549,086' 

G:;.320 J 

DATE FILED 

24 Aug 1944 

11 Aug 1944 

16 May- 1942 

INVENTOR(S) TITLE 

'William F. Friedman Authenticating Device 

William F. Friedman Electrical System 

William F. Friedman Cryptographic System and Frank B. Rowlett 

CONFIDENT!Al 

NATURE 

Mechanism for electrically authenticating messages 

Basis of Converter M-325 

(SIGFOY) 

The basic invention in-;;J valved in Converter M-228 

(SIGCUM). 
'"" .<t . 

PAT. NO. 

1.608.590 

1,516,180 

1,522,775 

1,530,660 

1,857,374 

2,028,772 

DATE.ISSUED 

30 Nov 1926 

13 Jan 1925 

1925 

1925 

10 May 1932 

28 Jan 1936 

REF ID :~)1~J~1Tl~l 

A. ISSUED PATENTS 

INVENTOR(S) 

William F. Friedman 

William F. Friedman 

and Louis M. Evans 

William F. Friedma.n 

William F. Friedman 

William F. Friedman 

William F. Friedman 

and Louis M. Evans 

William F. Friedman 

and George A. Grab.am 

TITLE 

Alphabetical Chart 

Secret Signaling System- Employing Apparatus for 

Automatically Encipher- ing and Deciphering Messages 

Secret Sign.aling- Appara tus for Automatically Enciphering and Deciphering Messages 

Printing Telegraph System 

Printing Telegraph System 

Cryptog~aph Enciphering and Deciphering Device 

Cryptographic System 

NATURE 

Means for composing 2-letter 

differential code symbols for various purposes. 

Introducing a third and 

intermittent, cipher-key, 

tape transmitter in a 

teletype encipherment system. 

Introducing a connectionchanging switchboard in a 

teletype encipherment system. 

Replacing multiplex prin- ciple with carrier frequencies. 

Replacing short-stop prin- ciple with modulated 

carrier. 

A cryptographic system employing Baudot enc1pherment principles, with a 

mechanism to be supe~1mposed 

on the keyboard of a standard typewriter for print- ing the text of messages. 

This was the first model 

Converter M-134 (T-1) with 

a single rotor and key tape control or the angular displacements of ~he rotor. 
t 'll' 

PkT: NO. 

2,028,772 

continued 

2,080,416 

2,139,676 

2,395,863 

2,166,137 

DATE ISSUED 

18 May 1937 William F. Friedman Message Authenticating System 

NATURE 

Very important because it 

is the first invention of 

electric control of 

aperiodic stepping of rotora 

For authenticating messages 

or various sorts. The 

apparatus includes a key- board, a perforated-card control, and an adding ma.chine mechanism. This 

is the first instance of 

an IMB card being used for - cryptographic keying purposes. 

13 Dec 1938 William F. Friedman Cryptographic Apparatus A single rotor using mechanical keying control, consisting of a set of cam 

wheels and a translator 

mechanism for combining the 

effects of the cam wheels. 

5 Mar 1946 William F. Friedman Cryptographic Device 

18 July 1939 William F. Friedma.n Electrical Switching and Frank B. Rowlett Mechanism 

Basic patent on Strip Cipher Device, Type M-138. 

Mechanism for causing an 

IBM electric sorter to 

"unsort" or randomize per- forated cards. 
REF ID:A67852 

tJ. e.....i:o 0-r-~~ 

.. ....., :d ---

6 

0 fL