“Mosaic Warfare” serves as a pivotal strategy in the U.S. military's implementation of “decision-centric warfare,” and it is poised to be a significant catalyst in the transition towards intelligent, unmanned combat operations. Within the framework of Mosaic Warfare, Unmanned Aerial Vehicle (UAV) systems play a crucial role due to their high autonomy, scalable deployment, and rapid response capabilities. They are instrumental in intelligence reconnaissance, electronic warfare, and firepower strikes. However, the complexity of UAV communication interactions and the absence of effective security measures introduce potential security and privacy vulnerabilities to the combat network. In anticipation of future unmanned combat scenarios, this paper analyzes the communication patterns, security and privacy issues, and types of attackers within UAV systems. It proposes a certificate-less security authentication method designed to protect against external attacks in UAV systems.