Security scheme for 4G wireless systems

4G mobile communication systems focus on seamlessly integrating the existing wireless technologies and providing great flexibility and mobility which complicate the security problem. In this paper the security policy including authentication authorization account and audit (AAAA) is discussed according to the features of 4G systems. Meanwhile the security architecture scenario based on hybrid PKI trust model and Mobile IPv6 is proposed. Over this architecture a novel hybrid authentication and key agreement scheme that associates dynamic password with public-key mechanism is presented to provide lightweight authentication and non-repudiation service. Compared with other architectures and protocols, our scheme is more flexible and convenient to support global mobility with low computational power and secure communication. So it is very suitable for 4C mobile communication systems.