Chapter 1.
SETTING THE STAGE
The cryptanalysts working for the Signals Intelligence Service[1] (SIS) of the U.S. Army knew how crucial it was to decipher and read Japanese secret messages. But this new code, "Purple," wasn't breaking.
For eighteen months the team struggled with this difficult Japanese diplomatic code. Then, one day in September 1940, Genevieve Grotjan made a discovery that would change the course of history. By analyzing and studying the intercepted coded messages, she found a correlation that no one else had yet detected. This breakthrough enabled other cryptanalysts to find similar links.[2] Shortly thereafter, SIS, along with the U.S. Navy, built a "Purple" analog machine to decode the Japanese diplomatic messages.
Almost sixty ...
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