Delusions of Intelligence - Enigma, Ultra, and the End of Secure Ciphers

In 1974, the British government admitted that its WWII secret intelligence organization had read Germany's ciphers on a massive scale. This book, the first comparative study of WWII SIGINT (Signals Intelligence), analyzes the characteristics that allowed the Allies SIGINT success and that fostered the German blindness to Enigma's compromise.