Intrusion Detection Systems has long been considered the most important reference for intrusion detection system equipment and implementation. In this revised and expanded edition, it goes even further in providing the reader with a better understanding of how to design an integrated system. The book describes the basic operating principles and applications of the equipment in an easy to understand manner. This book was written for those security directors, consultants, and companies that select the equipment or make critical decisions about security systems design. Mr. Barnard provides sufficient detail to satisfy the needs of those interested in the technical principles, yet has included enough description on the operation and application of these systems to make Intrusion Detection Systems, Second Edition a useful reference for any security professional.