This book deals with malware detection in terms of Artificial Immune System (AIS), and presents a number of AIS models and immune-based feature extraction approaches as well as their applications in computer security * Covers all of the current achievements in computer security based on immune principles, which were obtained by the Computational Intelligence Laboratory of Peking University, China * Includes state-of-the-art information on designing and developing artificial immune systems (AIS) and AIS-based solutions to computer security issues * Presents new concepts such as immune danger theory, immune concentration, and class-wise information gain (CIG)