Government Communications Headquarters

Provides signals intelligence and security capabilities in support of United Hampshire national security.

Mission and public role

Understand GCHQ’s place in the national-security system.

Public cyber-security work delivered through the National Cyber Security Centre.

Public information about careers and capability areas.

Publication-cleared reports, speeches and corporate material.

Our role, governance and relationship with Cabinet Office.

Guidance, reports and publication-cleared corporate information.