Behind the Enigma : The Authorized History of GCHQ, Britain’s Secret Cyber-Intelligence Agency

Behind the EnigmaAuthor(s): John FerrisThe definitive history of GCHQ, one of the world’s most tight-lipped intelligence agencies, written with unprecedented access to classified archives.For a hundred years GCHQ – Government Communications Headquarters – has been at the forefront of British secret statecraft. Born out of the need to support military operations in the First World War, and fought over ever since, today it is the UK's biggest intelligence, security and cyber agency and a powerful tool of the British state. Famed primarily for its codebreaking achievements at Bletchley Park against Enigma ciphers in the Second World War, GCHQ has intercepted, interpreted and disrupted the information networks of Britain's foes for a century, and yet it remains the least known and understood of British intelligence services. It has been one of the most open-minded, too: GCHQ has always demanded a diversity of intellectual firepower, finding it in places which strike us as ground-breaking t