The forthcoming 5G network promises enhanced performance across numerous applications, making it imperative for network security to evolve alongside these advancements. This monograph delves into the critical task of identifying potential security threats and privacy concerns that could potentially target the 5G network. Furthermore, it provides insightful solutions, including end-to-end security measures, privacy engineering strategies, service-oriented security approaches, and the implementation of a zero trust model, all of which are instrumental in fortifying the security of the 5G network. Chapter 1 describes security and privacy issues, Chapter 2 delves into the generations of networks and procedures for upgrading to the 5G network, Chapter 3 envisions the signal flow in 5G and its associated security attacks. Chapter 4, provides a detailed view of possible attacks on the 5G network, Chapter 5 addresses privacy challenges and solutions, Chapters 6, 7, and 8 details securityfeatures, improvements, and security aspects, respectively. Ultimately, this monograph serves as an enlightening overview of the comprehensive topic of "Security Enhancement in 5G Mobile Network".