"SIGINT is the acronym for 'signals in intelligence,' the most secret and least understood weapon in the modern espionage arsenal. In this groundbreaking book, author Nigel West traces the origins of British signals intelligence and gives a detailed account of SIGINT developments up to today. Here are the people and their techniques, their trials and errors, their successes and failures, their prejudices and personal enthusiasms that created the highly secret British Government Communications headquarters (better known as GCHQ), which was the model for the U.S. National Security Agency (NSA)."--Book Flap.