Edge-cloud collaborative application scenario is more complex,it involves collaborative opera-tions among different security domains,frequently access-ing and exiting application system of mobile terminals.A cross-domain identity authentication protocol based on privacy protection is proposed.The main advantages of the protocol are as follows.1)Self-certified key genera-tion algorithm:the public/private key pair of the mobile terminal is generated by the terminal members them-selves.It avoids security risks caused by third-party key distribution and key escrow;2)Cross-domain identity au-thentication:the alliance keys are calculated among edge servers through blockchain technology.Cross-domain identity authentication is realized through the signature authentication of the alliance domain.The cross-domain authentication process is simple and efficient;3)Revocab-ility of identity authentication:When the mobile termin-al has logged off or exited the system,the legal identity of the terminal in the system will also become invalid imme-diately,so as to ensure the forward and backward secur-ity of accessing system resources.Under the hardness as-sumption of discrete logarithm problem and computation-al Diffie-Hellman problem,the security of the protocol is proven,and the efficiency of the protocol is verified.

School of Computer Science and Technology,Beijing Institute of Technology,Beijing 100081,China;The 30th Research Institute of China Electronics Technology Group Corporation,Beijing 100088,China;China Electronic Science Research Institute of CETC,Beijing 100041,China;School of Computer and Communication Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China

[1]SUN Haipeng;TAN Yu'an;LI Congwu;LEI Lei;ZHANG Qikun;HU Jingjing-.An Edge-Cloud Collaborative Cross-Domain Identity-Based Authentication Protocol with Privacy Protection)[J].电子学报（英文）,2022(04):721-731

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