Ubiquitous Security

This book constitutes the proceedings of the Fourth International Conference on Ubiquitous Security, UbiSec 2024, held in Changsha, China, during December 29–31, 2024. The 27 full papers and 5 short papers included in this book were carefully reviewed and selected from 73 submissions. These papers were organized in the followingsections: Cyberspace Security, and Cyberspace Privacy.