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M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition <|
GBP 14.78
ApproximatelyAU $28.12
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eBay item number:126272352584
Item specifics
- Condition
- PublishedOn
- 2012-07-16
- Title
- M-209 Converter Encryption Machine Technical Manual 1944 Revised
- ISBN
- 9781937684693
- Publication Year
- 2012
- Type
- Textbook
- Format
- Paperback
- Language
- English
- Publication Name
- M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition
- Item Height
- 203mm
- Publisher
- Periscope Film, LLC
- Item Width
- 127mm
- Subject
- History
- Item Weight
- 100g
- Number of Pages
- 92 Pages
About this product
Product Information
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.
Product Identifiers
Publisher
Periscope Film, LLC
ISBN-13
9781937684693
eBay Product ID (ePID)
177048301
Product Key Features
Publication Name
M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition
Format
Paperback
Language
English
Subject
History
Publication Year
2012
Type
Textbook
Number of Pages
92 Pages
Dimensions
Item Height
203mm
Item Width
127mm
Item Weight
100g
Additional Product Features
Item description from the seller
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Value Added Tax number:
- GB 724498118
Seller assumes all responsibility for this listing.
eBay item number:126272352584
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