This book focuses on IoT authentication, which has been created through the joint efforts of many people. First of all, we would like to give thanks to all of the chapter authors for doing a great job!

This book would not have been possible without the help of many people. The initial idea for this book originated during our joint research work in 6Genesis Flagship (grant no. 318927) project, two COST Action projects (i.e. CA15127 RECORDIS and CA16126 SHELD‐ON) and RESPONSE 5G (Grant No: 789658) Marie Skłodowska‐Curie Actions (MSCA) project. We thank the European Union and MSCA Research Fellowship Programme who funded the above projects. We thank all the reviewers for helping us select suitable chapters for the book. Moreover, we thank anonymous reviewers who evaluated our proposal and provided many useful suggestions for improvement. We also thank Sandra Grayson from John Wiley and Sons for her help and support in getting this book published.

Also, the authors are grateful to the School of Computer Science at University College Dublin, Centre for Wireless Communication (CWC) at University of Oulu, Department of Computer Science at Swansea University and Department of Industrial Engineering at Vrije Universiteit Brussel for hosting the IoT Security related research projects which helped us gain the fundamental knowledge for this book. Last but not least, we would like to thank our core and extended families and friends for their love and support in getting the book completed.