The first authorised history of GCHQ, celebrating 100 years of Britain's most secretive intelligence agency, written with unprecedented access to classified archivesOne hundred years since GCHQ was established, this definitive account reveals the groundbreaking, top secret organisation, illuminating a hidden but vitally important part of the history of the UK. Working closely with the intelligence, security and cyber agency, signals intelligence historian John Ferris has been granted unprecedented access to classified records to trace the origins of GCHQ. The authorised history will chart the role of GCHQ from its origins in the First World War, through Bletchley Park and the Cold War to its discreet but crucial role in keeping the UK safe today. With revelations on almost every page, GCHQ: The Authorised History will bring the most secretive of British agencies into the public domain for the very first time.The first authorised history of GCHQ, celebrating 100 years of Britain's most secretive intelligence agency, written with unprecedented access to classified archivesOne hundred years since GCHQ was established, this definitive account reveals the groundbreaking, top secret organisation, illuminating a hidden but vitally important part of the history of the UK. Working closely with the intelligence, security and cyber agency, signals intelligence historian John Ferris has been granted unprecedented access to classified records to trace the origins of GCHQ. The authorised history will chart the role of GCHQ from its origins in the First World War, through Bletchley Park and the Cold War to its discreet but crucial role in keeping the UK safe today. With revelations on almost every page, GCHQ: The Authorised History will bring the most secretive of British agencies into the public domain for the very first time.