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In order to solve the problems of 5G network handover authentication and key update mechanism， such as lacking of forward security， being vulnerable to bypass attack and having signaling congestion， for 5G enhanced （B5G） network， an efficient handover authentication and security key-updating mechanism based on no certificate was proposed.The certificateless key agreement mechanism was introduced in the network edge side， which made the mobile terminals in-itiate the key-updating request actively and complete the whole certificateless key-updating process on the fly.The security of the key-updating mechanism was proved theoretically based on the Diffie-Hellman problem under the eCK security model.Simulation results demonstrate that the proposed mechanism not only meets the forward security of mobile terminal key management， but also has lower communication and computing overheads compared with other similar handoff authentication.

The intelligent terminal will greatly expand the applications of 6G .However,it will also make 6G face with greater security threats.The reliable terminal identification technology is the premise to ensure the security of 6G networks.Firstly,based on the network architecture and terminal characteristics,the requirements and challenges of 6G intelligent terminal identification were summarized.Then,the development trend was put forward for 6G intelligent terminal identification.Finally,physical layer authentication was explored to achieve possible realization of intelligent terminal identity authentication mechanism in 6G networks.