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From the Book: PREFACE: Preface In this age of electronic connectivity, of viruses and hackers, of electronic eavesdropping and electronic fraud, network security has assumed increasing importance. Two trends have come together to make the topic of this book of vital interest. First, the explosive growth in computer systems and their interconnections via networks has increased the dependence of both organizations and individuals on the information stored and communicated using these systems. This, in turn, has led to a heightened awareness of the need to protect data and resources from disclosure, to guarantee the authenticity of data and messages, and to protect systems from network-based attacks. Second, the disciplines of cryptography and network security have matured, leading to the development of practical, readily available applications to enforce network security. Objectives It is the purpose of this book to provide a practical survey of network security applications and standards. The emphasis is on applications that are widely used on the Internet and for corporate networks, and on standards, especially Internet standards, that have been widely deployed. Intended Audience The book is intended for both an academic and a professional audience. As a textbook, it is intended as a one-semester undergraduate course on network security for computer science, computer engineering, and electrical engineering majors. The book also serves as a basic reference volume and is suitable for self-study. Plan of the Book The book is organized in three parts: I. Cryptography: A concise survey of the cryptographic algorithms and protocols i reportunderlyingnetwork security applications, including encryption, hash functions, digital signatures, and key exchange. i See Appen II. Network Security Applications: Covers important network security tools and applications, including Kerberos, X.509v3 certificates, PGP, SMIME, IP Secu- rity, SSLTLS, SET, and SNMPv3. III. System Security: Looks at system-level security issues, including the threat of and countermeasures for intruders and viruses, and the use of firewalls and trusted systems. This book i A more detailed, chapter-by-chapter summary appears at the end of Chapter (CNS2e). 1. In addition, the book includes an extensive glossary, a list of frequently used detailed an< acronyms, and a bibliography. There are also end-of-chapter problems and sugges- of which co tions for further reading. dards (NSE 3. NSE1e in covers SNh Internet Services for Instructors and Students There is a Web page for this book that provides support for students and instruc tors. The page includes links to relevant sites, transparency masters of figures in the book in PDF (Adobe Acrobat) format, and sign-up information for the books Internet mailing list. The Web page is at ...