DocumentRelease Date: 2018-03-01
This undated GCHQ presentation, which includes speaking notes, outlines different techniques for contact chaining – moving from one contact to find all those associated with it: see the Intercept article How London’s 7/7 Bombings Led to “Unprecedented” Surveillance Tactics, 1 March 2018.
SECRET STRAP 1 Slide 15 © Crown Copyright. All rights reserved. This information is exempt from disclosure under the Freedom of Information Act 2000 and may be subject to exemption under oth...