Showing posts with label cryptology. Show all posts
Showing posts with label cryptology. Show all posts

Double-Edged Secrets: U.S. Naval Intelligence Operations in the Pacific During World War II (Bluejacket Books) Review

Double-Edged Secrets: U.S. Naval Intelligence Operations in the Pacific During World War II (Bluejacket Books)
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Jasper Holmes could have chosen as his title the phrase his colleague Edwin T. Layton used for his memoirs: And I Was There: Pearl Harbor and Midway - Breaking the Secrets. As a USN reservist returned to active duty at Pearl Harbor just months before the attack, Holmes was there at the start of the war. And he remained near the center of naval intelligence activities in the Pacific until the end.
My bigggest criticism of this book has nothing to do (directly) with Holmes himself. Like many memoirs written in the decades immediately after the war, this book is limited by the fact that much of the information Holmes would otherwise have been able to share was still officially secret. It would be for later researchers to say what Holmes couldn't.
The other complaint I have is that, based on what I've read elsewhere, Holmes modestly understates the important role he played in the events he describes. It's to his credit that he's eager to praise talented and dedicated cryptologists and analysts. But Holmes frequently makes himself sound like someone standing on the sidelines watching the varsity team play. In fact, he was one of the team's key players.
What could be a highly technical memoir is leavened by a light tone and entertaining asides, like his tales of trying to drive through Honolulu with darkened headlights (a feat he describes as probably a greater danger to the citizens of Honolulu than the Japanese attack was).
Any student of the war in the Pacific, and particularly of Naval Intelligence operations or the attack on Pearl Harbor, will find this an interesting and entertaining memoir.


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The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet Review

The Codebreakers: The Comprehensive History of Secret Communication from Ancient Times to the Internet
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This book is not intended to teach the reader how to design or cryptanalyze codes and ciphers; it is a history book, and a really great one. However, the reader should be aware of a couple of things that may not be apparent.
First, the 1996 "revised edition" differs from the 1967 first edition only in the addition of a final chapter to cover what Kahn didn't know (or didn't choose to include) in the 1967 edition. The first 26 of 27 chapters, and the references and bibliography associated with them, are essentially identical to those of the 1967 edition. This means that a number of statements and passages in the first 26 chapters, although correct in 1967, are misleading if one assumes they were written in 1996. I recommend that the reader skim Chapter 27 quickly before reading the rest of the book, so as not to misunderstand any of what's in earlier chapters.
Second, keep in mind that in 1967 Kahn was essentially an outsider so far as the intelligence community was concerned, but by 1996 he was definitely regarded as an insider. Hence, the new final chapter is written with complete respect for the sensitivities of the intelligence community, which the original book was not. I was surprised to see one particular statement in the last chapter until I realized that NSA wants to correct a misapprehension widely held outside the community. Much more important, Kahn now knows a great deal that he has chosen to omit from the last chapter, including much that's unclassified but still regarded by somebody as sensitive for one reason or another. He even omits certain material that he made publicly available some years ago in his written testimony to a Congressional subcommittee. So the reader should understand that this book says less than it might about various aspects of the history of cryptology and its impact dating back as far as World War II. Whether this is good or bad depends on where one sits; if one is concerned about the sensitivities of various governments, it's good; if one wants to know as much as one can about the history of cryptology since 1940 that's not still clasified, it's bad.

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The broken seal: the story of "Operation Magic" and the Pearl Harbor disaster Review

The broken seal: the story of Operation Magic and the Pearl Harbor disaster
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If the words Purple, Magic, or Arlington Hall do not hold a beguiling fascination for you then please see the other reviews. This is not a book about Pearl Harbor per se. It is a wonderful, concise history of the post WWI American intelligence and its early victories with Japanese code breaking. Fargo offers an engrossing tale of how we intercepted, broke, and disseminated intelligence from the Red, Purple, naval, and commercial Japanese codes prior to December 7th. This is a story about the birth pangs of modern intelligence, culminating in the failure to forecast the attack on Pearl. Fargo details the insights we had into Japanese foreign policy and the vagaries of 1930's espionage/counter espionage quite well. His first hand experience (he worked for ONI under Zacharias), access to sources, and first rate research still make this a great read, even though it is a bit dated. But it is not for just anybody.

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