Vehicular ad hoc network (VANET) is a traffic application of wireless sensor network, which is also a new mobile ad hoc networks composed of vehicle nodes, roadside units, service providers and other components. In VANET, data is transmitted by the wireless channel, which is subject to potential threat like information leak and data attack due to the openness and sensitivity of the auto organization network itself. How to ensure the identity privacy and trusted communication in VANETs is the key issue to be solved urgently. The existing work usually uses authentication mechanism, but the user's privacy disclosure is inevitable during the authentication process. Some anonymous authentication schemes have been proposed to solve the problem of privacy disclosure regardless of considering anonymity abuse. However, anonymity abuse is also severe in VANET. In view of the above problems, this paper proposes a scheme based on fair blind signature and secret sharing algorithm. By security analysis and experiment, the scheme has been proved to be higher anonymity and higher efficiency. KEYWORDSVehicular ad hoc network; anonymous authentication; track; fair blind signature; secret sharing algorithm

Vehicular ad hoc networks are traffic applications of the Internet of Things, which are composed of vehicle nodes, roadside units, service providers, and other components. In a vehicular ad hoc network, data transmission and management rely heavily on the wireless channel, which is subject to potential threats such as information leakage and data attacks due to the openness of the automotive network. The construction of a secure and trusted system that does not damage the privacy of vehicular ad hoc networks must be further addressed. Existing works usually focus on the anonymous authentication mechanism but neglect anonymity abuse. Furthermore, they always require a trusted third party as a central authority, which causes some security problems. In view of these problems, this article proposes a scheme that is based on the no-certificate-center algorithm. By security analysis and experiments, the scheme is proved to have higher anonymity and higher efficiency.

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