PDMSP: Privacy-Preserving Dynamic Multidestination Smart Parking Based on Blockchain

Smart parking services improve parking efficiency, reducing drivers’ time and fuel consumption. However, they may expose business secrets and personal information without privacy-preserving, threatening the competitiveness of service providers and user privacy. Although some schemes have attempted to address privacy issues in parking queries, existing schemes may leak query privacy when users query multiple destination information, and are also inefficient. In addition, as parking lot data changes dynamically, most existing parking schemes exhibit inefficiency when handling dynamic data updates, and cannot flexibly respond to frequent status changes. To this end, we propose a blockchain (BC)-based privacy-preserving dynamic multidestination smart parking scheme PDMSP, which can preserve the privacy of parking lots and drivers. It supports efficient one-time multidestination queries, while preserving the query information. Furthermore, it can perform lightweight dynamic updates. Security analysis and experimental results show that our scheme is secure and efficient, and the scheme can be efficiently updated.