The Un-Secret Secrets (United States News, 1945)
To get a sense as to how thoroughly the Japanese diplomatic codes had been compromised, we recommend that you read the attached article. It is composed entirely of the chit-chat that took place between the government functionaries in Tokyo, their diplomats in Washington, their spies in Hawaii and their representatives in Berlin.
The article winds up explaining that the one vital communication that contained the information regarding the day of Japan’s attack was not translated until December 8.