On February 1, 1943, the U.S. Army's Signal Intelligence Service, a forerunner of the National Security Agency, began a small, very secret program, later codena

This groundbreaking historical study reveals the shocking infiltration of Soviet spies in America—and the top-secret cryptography program that caught them. On

The Venona Secretspresents one of the last great, untold stories of World War II and the Cold War. In 1995, secret Soviet cable traffic from the 1940s that the

This sensational book, edited by NSA and CIA officers, reveals U.S. "code-breaking" successes in reading KGB and GRU messages during the Cold War. The cryptanal

The arrest, trial and execution of Julius and Ethel Rosenberg in 1951 mesmerised an America coming to grips with the early Cold War and the anxiety aroused by t