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Release Date: 2014-12-28
This undated presentation from GCHQ’s PTD (Penetrating Target Defences) unit gives an overview of BULLRUN efforts to defeat encryption: see the Der Spiegel story Prying Eyes: Inside the NSA’s War on Internet Security, 28 December 2014.
TOP SECRET STRAP1 BULLRUN PTD Lead for Special Operations and Policy PTD "We penetrate targets' defences." This information is exempt from disclosure under the Freedom of Information A...

BULLRUN CoI – Briefing Sheet


Release Date: 2013-09-05
This undated GCHQ document provides a classification guide for BULLRUN – NSA and GCHQ’s attempts to weaken or defeat cryptographic protocols – and specifies some of its achievements: see the ProPublica article Revealed: The NSA’s Secret Campaign to Crack, Undermine Internet Security, 5 September 2013.
TOP SECRET STRAP1 COMINT BULLRUN Col - Briefing Sheet Introduction 1. The ability to exploit targets’ encrypted communications is extremely fragile and is often enabled through sensiti...


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