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M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition by W...

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eBay item number:388275330066
Last updated on Jul 21, 2025 05:45:43 PDTView all revisionsView all revisions

Item specifics

Condition
Like New: A book that looks new but has been read. Cover has no visible wear, and the dust jacket ...
ISBN
9781937684693
Book Title
M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition
Publisher
Periscope Film, LLC
Item Length
8 in
Publication Year
2012
Format
Trade Paperback
Language
English
Item Height
0.2 in
Author
War Department
Genre
History
Topic
Military / World War II
Item Weight
3.5 Oz
Item Width
5 in
Number of Pages
92 Pages
Category

About this product

Product Identifiers

Publisher
Periscope Film, LLC
ISBN-10
1937684695
ISBN-13
9781937684693
eBay Product ID (ePID)
168590359

Product Key Features

Book Title
M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition
Number of Pages
92 Pages
Language
English
Topic
Military / World War II
Publication Year
2012
Genre
History
Author
War Department
Format
Trade Paperback

Dimensions

Item Height
0.2 in
Item Weight
3.5 Oz
Item Length
8 in
Item Width
5 in

Additional Product Features

Synopsis
Designed by Swedish cryptographer Boris Hagelin, the M-209 Converter was a portable, mechanical cipher machine. Used extensively during WWII and the Korean conflict by both the Army Signal Corps and the U.S. Navy (which designated it the CSP-1500), Hagelin's device allowed a rapid and secure means of communication. The lunchbox-sized machine was so simple that little training was required to use it, yet its cipher scheme proved very difficult - but not impossible - for the Germans to crack. The M-209's elegant design uses six adjustable key wheels or rotors to produce a reciprocal substitution - also known asa Beaufort cipher. The effect was that of sliding a normal alphabet sequence against the same sequence reversed, with a high degree of irregularity in the shifting process brought about by a train of gears. In the train of gears, the number of teeth on the driving number was also varied by the use of keying elements. Prepared by the War Department for the Signal Corps and other users, this M-209 technical manual was originally restricted, but is now considered declassified. It describes the operation and care of this fascinating device. This revised edition was originally printed in 1944 and contains severalsections not found in earlier versions, including maintenance and parts information. It provides a fascinating glimpse into mid-level encryption technology circa 1944.

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