Computer security involves safeguarding computers from theft or damage to their data, hardware, and, software. It also encompasses protecting computer systems from disruption or misdirection of services they provide. Threats to computer security are wide-ranging and not limited to phishing, spoofing, denial-of-service attacks, backdoors, and direct-access attacks. With growing reliance on computer technology, the Internet, wireless networks, and smart devices, computer security has become increasingly crucial. Countermeasures against cyberattacks include security by design, secure coding, security architecture, and hardware protection mechanisms. The topics covered in this extensive book deal with the core concepts related to computer security. It is an upcoming field that has undergone rapid development over the past few decades. This book will serve as a valuable source of reference for graduate and postgraduate students.