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Unmanned Aerial Vehicles (UAVs) are an important component of next-generationwireless networks that can assist in high data rate communications and provideenhanced coverage.Their high mobility and aerial nature offer deploymentflexibility and low-cost infrastructure support to existing cellular networksand provide many applications that rely on mobile wireless communications.However, security is a major challenge in UAV communications, and PhysicalLayer Security (PLS) is an important technique to improve the reliability andsecurity of data shared with the assistance of UAVs. Recently, IntelligentReflecting Surfaces (IRS) have emerged as a novel technology to extend and/orenhance wireless coverage by re-configuring the propagation environment ofcommunications. This paper provides an overview of how IRS can improve the PLSof UAV networks. We discuss different use cases of PLS for IRS enhanced UAVcommunications and briefly review the recent advances in this area. Then basedon the recent advances, we also present a case study that utilizes alternateoptimization to maximize the secrecy capacity for IRS enhanced UAV scenario inthe presence of multiple eavesdroppers. Finally, we highlight several openissues and research challenges to realize PLS in IRS enhanced UAVcommunications.

Opportunities for Physical Layer Security in UAV Communication Enhanced with Intelligent Reflective Surfaces