This April 2010 GCHQ report proposes an automated approach to seizing large numbers of mobile phone encryption keys: see the Intercept article The Great SIM Heist: How Spies Stole the Keys to the Encryption Castle, 19 February 2015.

This page from GCHQ’s internal GCWiki, dated 24 April 2012 describes procedures for searching through financial data retained by the agency, and cites examples of some of its sources: see the Intercept article Airport Police Demanded An Activist’s Passwords. He Refused. Now He Faces Prison In The UK, 23 September 2017.

These extracts from a GCHQ paper dated 10 March 2011 provide an indication of the agency’s ongoing effects (misinformation) and “online HUMINT” operations: see the Intercept article Britain Used Spy Team to Shape Latin American Public Opinion on Falklands, 2 April 2015.s

This collection of 13 spreadsheets illustrates the relationship between GCHQ and various ministries within the UK government and that agency’s work is by no means restricted to matters of national security, but also extends to domestic issues: see the Intercept article Controversial GCHQ Unit Engaged in Domestic Law Enforcement, Online Propaganda, Psychology Research, 22 June […]

This 42-page report from 10 March 2011 provides an overview of GCHQ’s information operations unit and the behavioural science theories that underpin its activities: see the Intercept article Controversial GCHQ Unit is Deeply Engaged in Law Enforcement, 22 June 2015.

This document lists the 193 governments, intragovernmental organisations and other entities which the NSA was granted the legal authority to intercept communications “about” for foreign intelligence purposes in August 2010: see the Washington Post article Court gave NSA broad leeway in surveillance, 30 June 2014.

This GCHQ research paper from 6 November 2009 outlines what kinds of data the agency can extract from internet radio stations and their listenership, grouped by country: see the Intercept article Profiled: From Radio to Porn, British Spies Track Web Users’ Online Identities, 25 September 2015.

A series of casual posts written by a single author stationed in the NSA’s Signals Intelligence Directorate and posted on the agency’s intranet in 2012. Several posts written in December of that year describe the rationale and methodology of targeting systems administrators: see the Intercept article Inside the NSA’s Secret Efforts to Hunt and Hack […]