Describing a variety of theoretical models and frameworks, this work explains how malicious attacks exploit vulnerabilities of computer networks. The authors present the concept of an anti-worm agent and discuss how it propagates by chasing and eliminating propagating worms. The book describes a number of simple, macroscopic models that allow the reader to draw formal conclusions about population groups with different characteristics. The text introduces adaptive Multi-Agent Systems and applies Evolutionary Game Theory to modeling interactions and objectives of interacting populations.