In
late 1940 members of the U.S. Army Signal Intelligence Service broke Japan's
highest level diplomatic code and then, using only analytic means, constructed
an analog of the code machine used by the Japanese. This allowed the U.S.
to read Japan's diplomatic traffic from then until after the end of the
war. Intelligence thus gained was cover named MAGIC because it seemed
that only magicians could have produced it. Because of its sensitivity
it was only available to a select few of the highest-level leaders in
our government.
While there
was considerable disagreement in the 1942 government regarding the necessity
for Japanese evacuation from the West Coast, not one person with access
to MAGIC argued against the action.
The messages
presented here are a selection from about a hundred that are reproduced
in the book that reveal Japan’s intentions and requirements for intelligence
on the U.S. in 1941.
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