"This book gives a well-organized survey on the security challenges and approaches in IoT. The contents include the system model, risk analysis, security mechanisms, and policy. Moreover, the authors also provide case studies of typical IoT applications such as vehicular ad hoc networks (VANETs), eHealth systems, and smart grids. ... This is a very good book for beginners in the area of IoT security. It is also a useful comprehensive study for IoT users, engineers, and managers." (Zheng Gong, Computing Reviews, March, 2017)