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Cryptography And Network Security: Principles And Practice is a book that provides a practical introduction to the topics of network security and cryptography. Summary Of The Book The world is interconnected in many different ways as never before, and global communication networks and the world wide web have shrunk the world so that no part of it is too remote to remain unaffected by this communication explosion. Technology has brought up many benefits, bringing communication infrastructure and facilities to every part of the world. If information is empowerment, then anybody who cares to spend some time on a computer is now a privileged citizen of the world. But, like everything else, technology brings with it some major problems, and the most discussed one is security. Not all data is meant to be shared with everyone, and keeping information private and secure is a challenge. Hacking, virus, and other malware and many other threats to information security need to be dealt with everyday, every minute. This book introduces its readers to these concepts and the book has been divided into two parts. The first part provides an introduction the the subjects of network security and cryptography. It also explains the features and capabilities of these technologies. The second part takes a look at the various implementations of these technologies, and runs a survey of the technologies at work in the real world. The four years since the previous edition has seen a lot of innovations and developments in the field and this edition has been thoroughly revised to integrate the new technologies in the content, while still maintaining the basic format of the book. Following an introductory chapter, the book is divided into seven sections. They deal with symmetric and asymmetric ciphers, cryptographic algorithms for data integrity, mutual trust, network and Internet security, system security, and legal and ethical issues involved in security implementations. About William Stallings William Stallings has more than 30 years of experience in the field of computer and network security, having worked with many high-tech firms. Some of his other books are Computer Organization and Architecture: Designing for Performance, Operating Systems: Internals and Design Principles, and Data and Computer Communications. Stallings has designed and implemented computer networks based on both OSI and TCP-IP protocols, using a variety of operating systems and computers. As a consultant, his services have been used by government agencies, major technology vendors, and other firms. Stallings has written a number of books on computer networks, network security, and cryptography. He has been the recipient of the award for the best computer textbook of the year from the Text and Academic Authors Association, eleven times.