In February 2022, Tech Against Terrorism organised a roundtable discussion on “Assessing the Threat of Terrorist Exploitation of E2EE Services and Existing Responses.” This event marked the launch of a three-part roundtable series on assessing and countering terrorist use of end-to-end encrypted (E2EE) services, aiming to highlight risk mitigation strategies that safeguard privacy and security. These sessions saw participation from counterterrorism experts, digital rights advocates, as well as government and tech sector representatives.

This summary report details key insights from these events, a threat assessment of terrorist use of E2EE services, an analysis of existing metadata on terrorist use of E2EE services, and proposed mitigation strategies.