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The key for location-based service popularization in vehicular environment is security and efficiency. However, due to the constrained resources in vehicle-mounted system and the distributed structure of fog computation, disposing of the conflicts between real-time implementation and user’s privacy remains an open problem. Aiming at synchronously preserving the position information for users as well as the data proprietorship of service provider, an efficient location-based querying scheme is proposed in this paper. We argue that a recent scheme proposed by Jannati and Bahrak is time-consuming and vulnerable against active adaptive corruptions. Thus accordingly, a postquantum secure oblivious transfer protocol is devised based on efficient NTRU cryptosystem, which then serves as the understructure of a complete location-based querying scheme in ad hoc manner. The security of our scheme is proved under universal composability frame, while performance analysis is also carried out to testify its efficiency.

NTRU Implementation of Efficient Privacy-Preserving Location-Based Querying in VANET