cesG

CESG, or the Communications-Electronics Security Group, was a former British government organization. It operated as the information assurance and security arm of GCHQ, the UK's intelligence and security agency. CESG's primary role was to protect UK government communications and sensitive information from electronic threats. This included providing advice and services on cybersecurity, cryptography, and secure communication systems to various government departments and agencies.

Established in 1947, CESG evolved over the decades, adapting to the changing landscape of cyber threats and technological advancements. Its work was crucial in maintaining the security of national infrastructure and safeguarding classified information. CESG was known for its expertise in developing and implementing security standards and best practices for the public sector.

In 2016, CESG was formally disbanded and its functions were integrated into GCHQ's broader cybersecurity capabilities. This restructuring aimed to streamline operations and enhance GCHQ's overall capacity to combat cyber risks. While the CESG name is no longer in active use, its legacy continues within GCHQ's ongoing mission to protect the UK from cyber threats.