Abstract: The dynamic vehicle insurance evaluation mode based on Vehicular ad-hoc network(VANET) analyzes user behavior by collecting real-time data, and then realizes the behavior driven of insurance fee collection. However, providing real-time data can easily lead to the disclosure of private information, which might discourage users from contributing data and thus affect the effectiveness of the evaluation. This paper designs a novel ring signature scheme to preserve user privacy by implementing broken links between data uploaders and data. When the quantity of data increases, this solution relies on the batch verification algorithm to reduce the signature verification overhead of the data collection platform and improve verification efficiency. Meanwhile, the selective conversion mechanism from anonymous signature to normal signature is designed to verify whether the user is the owner of the data in response to the user's need to declare the ownership of the data. The experimental results show that the computational overhead of the single signature process does not increase significantly in this scheme with a larger number of signing users, and the efficiency of the server-side signature verification is much higher than that of existing schemes. When both the signature group and the number of signatures increase, this scheme still maintains better performance.

Key words: Vehicular network, Vehicle insurance assessment, Certificateless signature, Batch verification, Convertible signature