JF Ptak Science Books // Blog Bookstore:

Rare, scarce, interesting, and unusual books for sale, mostly in the history of physics, math, and technology. The bookstore site is part of a larger daily blog for the History of Holes, Dots, Lines, Science, History, Math, the Unintentional Absurd & Nothing |1.8 million words, 7000 images, 4.6 million hits, and 4600+ posts over 11 years| Press & appearances in The Times, Mensa, Le Figaro, The Economist, The Guardian, Discovery News, Slate, Le Monde, Sci American Blogs, Le Point, and many other places...

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« Separates from the Bulletin of the American Mathematical Society, 1910-1925 | Main | »

Advanced Military Cryptography. TM11-485, US War Department, 8 June 1944. "Restricted" document. 9x6 inches, 113--, with a folding plate and other text illustrations. Nice copy in original wrappers, with a name on the front wrapper. $150

Topics include (jn five sections):

A: Transposition Systems
- Monophase transposition systems
- Polyphase transposition systems
- True double transposition
- Grids and other types of matrices
- Miscellaneous transposition systems
B: Substitution System
- Polygraphic Systems
- Checkerboard digraphic substitution
- Complex substitution systems
C: Repetitive and Combined Systems
- Repetitive Systems
- Combined substitution-transposition system
D: Cryptographs and Cipher Machines
- Cryptographs
- The obsolete U.S. Army cipher device, type M-94
- Cipher machines
E: Code Systems
- Code systems in general
- Enciphered code

Posted by John F. Ptak in Mathematics, Music | Permalink

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