HIS343Y1 Lecture Notes - Lecture 10: Type B Cipher Machine

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4 Dec 2017
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Kahn the united states views germany and japan in. The most secret was machine cipher (purple) friedman headed a team reconstructed the machine in august 1940: later the americans read top japanese diplomatic messages almost as fast as the japanese diplomats. Yet, the correspondents in tokyo were mostly young and relatively inexperienced newcomers none knew japanese; few had much previous knowledge of japan. American intelligence: though they acknowledge that an attack on pearl harbor was not impossible, they dismissed it as improbable. The us navy gathered radio intelligence and made false deductions from it, the diplomats sought clues to japanese intentions found nothing concrete. Did not know whether japan would move north or south. Nor did specific information come from magic(the important intercepts selected by the top officers of the army and navy far eastern intelligence from the messages obtained from purple)

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