I am reading this book, Second Front Now 1942, An Opportunity Delayed by Walter Scott Dunn Jr.and on page 46 I read this:
On page 191:"At the same time, the Germans had cracked the British naval codes and were reading the Admiralty messages, so that each side jockeyed its ships across the Atlantic like a gigantic chess game, each trying to react to decoded information in such a manner that the other would not know that its messages were being deciphered." (footnote 12, Fred W. Winterbotham, The Ultra Secret (New York: Dell, 1974) pp. 126-27
Is this true? I don't believe I have every read this before, not a big reader of intelligence operations and counter intelligence operations, but I would of thought that I would of read this in another book on World War II."The Germans also penetrated the scrambler telephone that Roosevelt and Churchill used. The scrambler telephone was invented in 1939 and was first used by Roosevelt in September. By March 1, 1942, the Germans had discovered a method of unscrambling the conversations and were tapping the transatlantic telephone cable. On March 6, 1942, Hitler was informed that all telephone traffic between Britain and the United States was being deciphered. . . "
Mike