This 15 June 2012 article from the internal NSA newsletter SIDToday “SIGINT Philosopher” column tackles the subject of partial information: see the Intercept article The Philosopher of Surveillance, 11 August 2015.
This NSA presentation from 16 July 2009 explains how the XKeyScore system supports the agency’s Tailored Access Operations: see the Intercept article XKEYSCORE: NSA’s Google for the World’s Private Communications, 1 July 2015.
This 7 February 2010 NSA presentation outlines techniques to “discover, understand, evaluate, and exploit foreign CNE/CNA exploits”: see the Der Spiegel article The Digital Arms Race: NSA Preps America for Future Battle, 17 January 2015.
This 12 July 2012 post from the NSA internal newsletter SIDToday describes the work of Tailored Access Operations (TAO) from the perspective of a practitioner: see the Der Spiegel article The Digital Arms Race: NSA Preps America for Future Battle, 17 January 2015.
This undated NSA presentation describes how to perform attacks against VPNs: see the Der Spiegel story Prying Eyes: Inside the NSA’s War on Internet Security, 28 December 2014.
This internal NSA post from 1 February 2006 describes the visit several agency personnel to bases in Germany: see the Der Spiegel article Spying Together: Germany’s Deep Cooperation with the NSA, 18 June 2014.
This internal NSA post from September 2006 describes the evolution of the European Security Operations Center and the focus of the US-German collaboration in signals intelligence: see the Der Spiegel article Terrorverdächtige: NSA nutzte Erkenntnisse aus Deutschland-Filiale für Tötungen, 15 June 2014.
An internal Special Source Operations document describes the volume of user account information obtained from Yahoo data centres amid internal NSA complaints about its limited intelligence value: see the Washington Post article NSA infiltrates links to Yahoo, Google data centers worldwide, Snowden documents say, 30 October 2013.
Nineteen slides from a 41-slide April 2013 NSA presentation describing the PRISM collection of data via internet service providers, “the SIGAD most used in NSA reporting.” Slides have been published gradually by several media organisations: see the Washington Post article NSA slides explain the PRISM data-collection program, 6 June 2013.