This GCHQ research report dated 20 September 2011, cowritten by researchers at Heilbronn Institute for Mathematical Research based at the University of Bristol, concerns the use of data mining techniques to develop usable intelligence as well as the contradictions that arise from the use of algorithms to identify wrong doers, or potential wrong doers. The paper also provides a great deal of background information on GCHQ operations and the detailed discussion of network theory demonstrates the power of metadata collection: see the Boing Boing article Doxxing Sherlock, 2 February 2016.
This two-page extract from a longer, undated, GCHQ document describing its presence in Cyprus, states that “Under the ECHELON Agreement, NSA provides 50% of the funding for the SOUNDER Comsat facility”: see the Intercept article GCHQ and Me: My Life Unmasking British Eavesdroppers, 3 August 2015.
This NSA classification guide, dated 21 November 2011, covers signals intelligence material that as to be kept secret for more than the standard 60 years: see the Der Spiegel article The NSA in Germany: Snowden’s Documents Available for Download, 18 June 2014.
Extracts from a 2005 draft directive from the NSA’s director of signals intelligence reveal that, contrary to the “common understanding” that the a no-spying agreement existed between members of the ‘Five Eyes’ intelligence alliance (comprising the UK, US, Canada, Australia and New Zealand), the NSA reserved the right to target allies unilaterally in certain circumstances: see the Guardian article US and UK struck secret deal to allow NSA to ‘unmask’ Britons’ personal data, 20 November 2013.