Interesting because USA had broken "Purple" the Japanse diplomatic cipher machine. I had not realized that there where 10 inquiries about this. Also there is

Interesting because USA had broken "Purple" the Japanse diplomatic cipher machine. I had not realized that there where 10 inquiries about this. Also there is precedent in the form of the Zimmerman telegram- which British Intelligence got by tapping cross-Atlantic cables and by breaking the cipher used: https://en.wikipedia.org/wiki/Zimmermann_Telegram https://en.wikipedia.org/wiki/Zimmermann_Telegram