Khoa N. LE received his Ph.D. from Monash University (Victoria, Australia) in Signal Processing and Telecommunications. He is co-founder of Ecobond Pty Ltd in addition to an Honorary Professor performing research on wireless communications at Posts and Telecommunications Institute of Technology, Vietnam. He was previously a Senior Lecturer and Head of Program at Western Sydney University, Australia; Visiting Professor, University of Technology Malaysia, among other positions. He has presented at global conferences, receiving many awards including best paper, top publication prize, among others. He has edited and contributed to several publications and published dozens of journal articles. He is currently Editor for the IEEE Transactions on Vehicular Technology, and IEEE Wireless Communications Magazine, and IET Signal Processing.

• Chapter 1. Physical Layer Security in Hybrid Satellite-Terrestrial Relay Networks.- Chapter 2. Secure Transmission with Directional Modulation Based on Random Frequency Diverse Arrays.- Chapter 3. Physical Layer Security in Cache-Enabled Heterogeneous Cellular Networks.- Chapter 4. Backash Light as a Security Vulnerability in Quantum Key Distribution Systems.- Chapter 5. Cooperative Physical Layer Secret Key Generation by Virtual Link Estimation.- Chapter 6. Physical Layer Security: Authentication, Integrity and Con dentiality.- Chapter 7. Secure Device Pairing Protocol Based on Wireless Channel Characteristics for Body Area Networks.