Editing Bibliography of cryptography (section)

===Declassified works===
*Boak, David G. ''[https://www.governmentattic.org/18docs/Hist_US_COMSEC_Boak_NSA_1973u.pdf A History of U.S. Communications Security (Volumes I and II); the David G. Boak Lectures],'' National Security Agency (NSA), 1973, A frank, detailed, and often humorous series of lectures delivered to new NSA hires by a long time insider, largely declassified as of 2015. 
*[[Lambros D. Callimahos|Callimahos, Lambros D.]] and [[William F. Friedman|Friedman, William F.]] [[Military Cryptanalytics]]. A (partly) declassified text intended as a training manual for [[National Security Agency|NSA]] cryptanalysts.
* [[William F. Friedman|Friedman, William F.]], [https://www.nsa.gov/Portals/70/documents/news-features/declassified-documents/friedman-documents/publications/ACC15281/41785109082412.pdf Six Lectures on Cryptology], National Cryptology School, U.S. National Security Agency, 1965, declassified 1977, 1984
*{{cite web|url=http://cryptocellar.web.cern.ch/cryptocellar/PURPLE_History.pdf|archive-url=https://web.archive.org/web/20130404171310/http://cryptocellar.web.cern.ch/cryptocellar/PURPLE_History.pdf|url-status=dead|archive-date=April 4, 2013|title=Preliminary Historical Report on the Solution of the Type "B" Machine|last=Friedman|first=William F.|date=October 14, 1940}} (How the Japanese Purple cipher was broken, declassified 2001)