3GPP 5G Security

5G is the next generation of mobile communication systems. As it is being finalized, the specification is stable enough to allow giving an overview. This paper presents the security aspects of the 5G system specified by the 3^rd Generation Partnership Project (3GPP), especially highlighting the differences to the 4G (LTE) system. The most important 5G security enhancements are access agnostic primary authentication with home control, security key establishment and management, security for mobility, service based architecture security, inter-network security, privacy and security for services provided over 5G with secondary authentication.