Explaining the fundamentals of cyber security and digital forensics, this text covers the basic principles of intrusion detection systems, encryption, and authentication. Beginning with an overview of general concepts in security, it addresses hashing and digital certificates, enhanced software security, and network security. It introduces the concept of risk, threat analysis, and network forensics and covers data hiding, obfuscation, web infrastructures, and cloud and grid computing. Simulators, test questions, labs, and online lectures and related material are made available on the book’s website.