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Many cryptographic schemes and protocols, especially those based on public-keycryptography, have basic or so-called "textbook crypto" versions, as these versionsare usually the subjects for many textbooks on cryptography. This book takes adifferent approach to introducing cryptography: it pays much more attention tofit-for-application aspects of cryptography. It explains why "textbook crypto" isonly good in an ideal world where data are random and bad guys behave nicely.It reveals the general unfitness of "textbook crypto" for the real world by demonstratingnumerous attacks on such schemes, protocols and systems under variousreal-world application scenarios. This book chooses to introduce a set of practicalcryptographic schemes, protocols and systems, many of them standards or de factoones, studies them closely, explains their working principles, discusses their practicalusages, and examines their strong (i.e., fit-for-application) security properties, oftenwith security evidence formally established. The book also includes self-containedtheoretical background material that is the foundation for modern cryptography.
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- Hardcover: 648 pages
- Publisher: Prentice Hall; 1 edition (August 4, 2003)
- Language: English
- ISBN-10: 0130669431
- ISBN-13: 978-0130669438
- Product Dimensions: 1.3 x 7.2 x 9.4 inches
- Shipping Weight: 2.9 pounds
Free Modern Cryptography: Theory and Practice
Modern Cryptography is by far the best first text on cryptography I've ever seen, blowing books like Applied Cryptography out of the water. It's a clear treatment that focuses on building practical systems, focusing on how to avoid common pitfalls. The focus of this book is the correct design of cryptographic protocols that resist attack. This is in contrast to books like Applied Cryptography, which focuses on the tools and the building blocks used to construct systems, glossing over how to use those things together to build strong systems. While the innards of block ciphers and so on can be interesting, Schneier himself is prone to saying something along the lines of, "The world is filled with insecure systems built by people who read Applied Cryptography". That is, in order to build secure systems with cryptography, one should understand how to use cryptographic tools properly. We do not need to know how the tools themselves work... we can take it for granted as long as we understand their behavior.
It must be said that the average person shouldn't be designing their own cryptographic protocols, either. One of the things this book does well is demonstrate the large number of non-intuitive ways in which cryptographic protocols can go wrong. For example, the chapters on authentication schemes demonstrate a large number of schemes authored by reputable cryptographers that turned out to have significant weaknesses.
For the above reason, this probably isn't a text that needs to be on everybody's desk. I would say it is essential for anyone who wants to understand why protocol design is so hard, and it is also valuable to the few people who will go on to build new protocols, particularly graduate students in cryptography.