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Robert Stinnett, author of Day Of Deceit (New York: Simon & Schuster,) totally wrong and misinterpets US cryptoligist. No US Cryptoligist during WW2 ever broke Japanese codes either AN1-JN1 or Diplomatic code period. US cryptologist as per 1945 Congressional hearings testimony confirms that US only could 'read' a small percentage as much as 12% percent for example the JN1 Japanese Naval code under the best of circumstances.

Stinnett then goes on to assert that IJN 'Japanese Navy' broke radio silence prior to the attack on Pearl Harbor Dec.7 1941. Wrong - Stinnet quotes sources that report IJN radio transmission originating from IJN Strike Fleet just day or days from Hawaii and could be detected easily and have raised the alarm.

These sources located from ship or land based along pacific rim ie; West Coast did hear IJN 'Japanese Naval' radio transmissions except they originated from Japan. Part of Japans surprise attack was to make it appear that the Japans fleet was still in home waters and not to raise alarm.
note. Believe it or not- part of warfare includes deception and confusing your enemy.

Stinnett and others like yourself are sloppy and misinterpt facts to fit your own fantasy and your facts are nothing but sloppy research.