Behind the Enigma: The Authorized History of GCHQ, Britain’s Secret Cyber-Intelligence AgencyEbookBehind the Enigma: The Authorized History of GCHQ, Britain’s Secret Cyber-Intelligence AgencybyJohn FerrisRating: 0 out of 5 stars0 ratingsSave Behind the Enigma: The Authorized History of GCHQ, Britain’s Secret Cyber-Intelligence Agency for later