Friday, July 10, 2015


I’ve added links to files from the NSA’s Friedman collection in some of my essays. Specifically:

1). In State Department’s strip cipher – reuse of alphabet strips and key lists I added links to the State Department security survey 1941 and 1943.
2). In Japanese codebreakers of WWII I added the book The Japanese Version of the Black Chamber(the Story of the Naval Secret Chamber) by Toshiyuki Yokoi

4). In The American M-209 cipher machine i added the M-209 manual from 1944.

I’ve also added links to Mark J. Blair's M-209 Group and Top Level Telecommunications.

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