After taking half the book for what might be the most boring WW2 autobiography in print, we get an excellent look at Japanese cryptosystems and how they were attacked. If you're interested in crypto-stuff you'll love this book. If not, keep looking.
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The author was a cryptographer working out of Australia during WWW II. This is his personal narrative and an operational history combined. Not definitive because at the time of writing much documentation remained to be declassified. A worthwhile addition to a SIGINT collection.
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