Improved SRP algorithm and bidirectional heterogeneous LTE‐R authentication key

Due to the problems that International Mobile Subscriber Identity is not encrypted during transmission, key disclosure, and high authentication overhead in Evolved Packet System-Authentication Key Agreement, next generation of high-speed railway Long-Term Evolution for Railway train ground protocol, this paper describes improved Secure Remote Password algorithm two-way heterogeneous agreement scheme. First, used encrypt message transmission between User Equipment Mobility Management Entity, solving problem being transmission. Then, a digital signature method Public Infrastructure Identity-Based Cryptosystem proposed authenticate negotiate with Entity Home Server, which improves security root can effectively prevent man middle, replay other attacks. Finally, research results, random oracle model verify, results show our superior comparison cost, meet communication requirements.