A high-speed railway symbiotic network security handover authentication scheme based on NTRU lattice is proposed to address the issues of identity leakage

lack of forward and backward security

and high authentication overhead during the evolution of the high-speed railway GSM-R wireless communication system to the next generation 5G-R network during vertical handover. Firstly

a bidirectional authentication mechanism based on NTRU lattice was designed to overcome the vulnerability of identity information SUPI plaintext transmission to leakage. Second

a shared key-based hash chain encryption technique is suggested. To accomplish pre-creation of handover authentication keys

shared key generation and symbiotic network switching token strategies are created

guaranteeing dynamic updates of shared keys and forward and backward security. Then

using the Chinese remainder theorem and timestamp mechanism

the confidentiality of the session key was achieved

and the handover authentication of the symbiotic network was completed. Finally

the security of the proposed method was analyzed using BAN logic theory and TAMARIN protocol simulation verification tools. The findings demonstrate that

in comparison to comparable techniques

the suggested approach guarantees identity anonymity and forward and backward key security

can successfully fend off DoS and man-in-the-middle attacks

has lower switching costs

and can satisfy the demands of seamless handover authentication for high-speed rail symbiotic network security.