This book demonstrates the breadth and depth of IP protection through logic locking, considering both attacker/adversary and defender/designer perspectives. The authors draw a semi-chronological picture of the evolution of logic locking during the last decade, gathering and describing all the DO's and DON'Ts in this approach. They describe simple-to-follow scenarios and guide readers to navigate/identify threat models and design/evaluation flow for further studies. Readers will gain a comprehensive understanding of all fundamentals of logic locking. Covers modern VLSI design, testability and debug, and hardware security threats at different levels of abstraction; Provides a comprehensive overview of logic locking techniques and their applications to hardware security; Covers logic locking from implementation to evaluation, different assumptions, models and abstraction layers.