'This book is a major addition to the existing literature on code breaking during the Second World War, and may well create a stir among historians of cryptology, especially in Europe.' Intelligence of National Security
'A fascinating book! If I was still teaching I would get my students to read it.' Professor Robert Moore, University of Liverpool
'… is well written and accessible and is indispensable to any student of wartime intelligence. For the general reader, it is an excellent introduction to the topic of wartime code breaking.' The Times Higher Education Supplement
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.