Derived from the Greek words kryptos meaning hidden and graphein meaning writing, Cryptography is the study of encrypting and decrypting text. History has witnessed many instances of this technique at use. Nineteenth century scholars decrypted ancient Egyptian hieroglyphics when Napoleon's soldiers found the Rosetta Stone in 1799 in Egypt.

With the onset of the age of computers and the internet, Cryptography and Network Security has been taken to a different level altogether. The stupendous growth of the Internet opened up unlimited opportunities for computing. However, at the same time, it also brought about a plethora of new issues and concerns, chief among them being the security of information being exchanged.

With such a scene emerging, Atul Kahate’s book on Cryptography and Network Security presents a refreshing approach to the study of this subject. It gives an account of all the topics that come under the umbrella of information security.

The new edition of this book carries a lot of changes that make it even better than the previous edition. The coverage has been made more comprehensive to make them up to date, wherever possible.

This book is targeted at two sets of readers: undergraduate/graduate/post-graduate students and IT professionals. To satisfy the diverse needs of both these categories, the book is designed very carefully. On one hand, it goes into the depth of every aspect, to satisfy the needs of the students, and on the other, it touches upon the aspects that the IT professionals like to know at a conceptual level.

With this second edition, new sections on legal and ethical issues in Cryptography, Variations of the SHA- 1 Message Digest Algorithm, Digital Certificates in Java, and Cryptography in Microsoft’s .NET framework has been included, along with expanded coverage of topics like Advanced Encryption Standards, PGP, and SSL.

This accompanying Online Learning Center is designed to enhance your learning experience. It provides a broad array of resources that will benefit both the instructors and students. Visit the Information Center to unravel the book's features.

The Student’s Center contains Important Terms and Abbreviations, Additional Programming Exercises, Cryptography Demos, Real Life Case Studies and Web References.

The Instructor’s Center provides instructors with the Chapterwise Powerpoint Slides, Answers to Design/Programming Exercises and chapter end Multiple-Choice Questions.

This part of the site is password protected and will be available only to the instructors who adopt the book. If you are an adopter and require a password, contact your McGraw-Hill representative or send a request from this Web site.

This site will evolve over time and we would be able to provide you with a wide range of goodies that are currently under development.