Man has created codes to keep secrets and has broken codes to learn those secrets since the time of the Pharaohs. For 4,000 years, fierce battles have been waged between codemakers and codebreakers, and the story of these battles is civilization's secret history, the hidden account of how wars were won and lost, diplomatic intrigues foiled, business secrets stolen, governments ruined, computers hacked. From the XYZ Affair to the Dreyfus Affair, from the Gallic War to the Persian Gulf, from Druidic runes and the kaballah to outer space, from the Zimmermann telegram to Enigma to the Manhattan Project, codebreaking has shaped the course of human events to an extent beyond any easy reckoning. Once a government monopoly, cryptology today touches everybody. It secures the Internet, keeps e-mail private, maintains the integrity of cash machine transactions, and scrambles TV signals on unpaid-for channels. David Kahn's The Codebreakers takes the measure of what codes and codebreaking have meant in human history in a single comprehensive account, astonishing in its scope and enthralling in its execution. Hailed upon first publication as a book likely to become the definitive work of its kind, The Codebreakers has more than lived up to that prediction: it remains unsurpassed. With a brilliant new chapter that makes use of previously classified documents to bring the book thoroughly up to date, and to explore the myriad ways computer codes and their hackers are changing all of our lives, The Codebreakers is the skeleton key to a thousand thrilling true stories of intrigue, mystery, and adventure. It is a masterpiece of the historian's art.
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The Christian Science Monitor A literary blockbuster...for many evening of gripping reading, no better choice can be made than this book.
Time Perhaps the best and most complete account of cryptography yet published.
The New York Times Book Review A notable achievement...Mr. Kahn has presented the specialist and the general public with a lavishly comprehensive introduction to a subject of basic significance for both.
Prepublication National Security Agency Evaluation, now declassified The book in its entirelty constitutes the most publicly revealing picture that has ever been presented of U.S. Sigint activities and the agencies engaged in this field.
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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.
Kahn does not create a textbook for the serious cryptologist; such a work would be more mathematical in approach. What he does is give, from a layman's view, a good mid-level history of the art/science of cryptology. The first chapter, covering the cryptanalytic events of Pearl Harbor, brings you in; then he goes over the history of secret writing from the days of Egyptian hieroglyphics to roughly the present day. Interesting areas include the discussion of the European "black chambers" of the 1600s and 1700s, a good talk about how rumrunners in the Prohibition days used complex code/cipher combinations to thwart the Noble Experiment, and a highly entertaining chapter on the "ciphers" that proved Francis Bacon wrote Shakespeare's works.
The updated edition falls short in its attempt at updating, which is why I don't give another star to the book. The discussion of cryptography in the world of the Internet is far too thin to satisfy. This, of course, could be a function of the beast; the Internet and electronic cryptology changes faster than any book could keep up with. In addition, information on the Enigma and other areas of World War II cryptology, declassified since the previous edition, could have been added to increase understanding of this critical time. However, the remaining "classic" text is still excellent, and has served as the layman's reference on cryptologic history for thirty years.
The bit about code purple in WW2 was completely unknown to me. Read more
It is still of interest to me, but I thought I was buying the book I had read in... Read more
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