Military Cryptanalytics Part I
Washington, D.C. National Security Agency, 1956.
First thus. Part I only. iv, 444 pp. Bound in publisher's brown cloth lettered in gilt. Good with slant to spine and rubbing, soiling, and dampstaining to boards. Contents toned, inked numbers to front endsheet, dampstaining to rear endsheet and lower right corner of final 80 pages. "Modified Handling Authorized" blocked in red crayon on title page.
An updated and expanded version of Friedman's text Military Cryptanalytics, prepared with his assistance by Callimahos as a training manual for the National Security Agency. It was such a secretive agency at the time the running joke was that its initials stood for "No Such Agency." Friedman is a legendary figure in the field of cryptology who helped break the Japanese PURPLE code before WWII. Though marked "classified" on every page, this volume has long been declassified. Rare.
Price: $2,000