The Puzzle Palace: A Report on NSA, America's Most Secret Agency

The Shadow Factory: The Ultra-Secret NSA from 9/11 to the Eavesdropping on America

Body of Secrets: Anatomy of the Ultra-Secret National Security Agency

A Pretext for War: 9/11, Iraq, and the Abuse of America's Intelligence Agencies

Code Warriors: NSA's Codebreakers and the Secret Intelligence War Against the Soviet Union

Gordon Welchman: Bletchley Park's Architect of Ultra Intelligence

Working on the Dark Side of the Moon

No Place to Hide: Edward Snowden, the NSA, and the U.S. Surveillance State

The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet

The American Black Chamber (Bluejacket Books)