This timely textbook presents a comprehensive guide to the core topics in computing and information security and assurance realms going beyond the security of networks to the ubiquitous mobile communications and online social networks that have become part of daily life.In the context of growing human dependence on a digital ecosystem this book stresses the importance of security awarenesswhether in homes businesses or public spaces. It also embraces the new and more agile and artificialintelligenceboosted computing systems models online social networks and virtual platforms that are interweaving and fueling growth of an ecosystem of intelligent digital and associated social networks. Thisampampnbspfully updated editionampampnbspfeatures new material on new and developing artificial intelligence models across all computing security systems spheres blockchain technology and the metaverse leading toward security systems virtualizations.Topics and featuresExplores the range of risks and vulnerabilities in all connected digital systemsPresents exercises of varying levels of difficulty at the end of each chapter and concludes with a diverse selection of practical projectsDescribes the fundamentals of traditional computer network security and common threats to securityDiscusses the role and challenges of artificial intelligence in advancing the security of computing systems algorithms protocols and best practicesRaises thoughtprovoking questions regarding legislative legal social technical and ethical challenges such as the tension between privacy and securityOffers supplementary material for students and instructors at an associated website including slides additional projects and syllabus suggestionsThis important textbookreference is an invaluable resource for students of computer science engineering and information management as well as for practitioners working in data and informationintensive industries.Professor Joseph Migga Kizzaampampnbspis a professor former Hea