Insufficient parking space and traffic congestion are important usual suspects in our urban life. Organisation and managing available parking spaces have raised a lot of awareness. Traditional centralized parking approaches are with an insidious single point of failure and unsuitable for large organization because the manager is overburdened with authority and responsibility. The malicious service provider enables to (i) track the precise mobility patterns of citizens. (ii) collect the data to infer privacy-sensitive information, e.g., where the parking requester (i.e., driver) socialize, work, and live; (iii) analyze trajectories to monitor the location of the driver for entertainment (e.g., discovering one-night stands). To design a decentralized smart and practical parking platform without compromising the privacy of the entities is an urgent issue for the smart city. Blockchain (or distributed public ledger technology) is a near-ideal decentralized and distributed solution for centralized parking-space-recommendation systems. However, most of the existing parking recommendation solutions on top of blockchain ignore to protect the privacy of drivers during parking spot detection and matching phases while cannot maintain the property of anonymity of the drivers. In this paper, an efficient and privacy-preserving parking-space recommendation service platform, named as PriParkRec, along with the proof-of-concept solution to protect the requester's privacy in PriParkRec while maintaining most of the benefits of current parking-space sharing service, i.e., accountability, (anonymous) authentication, (anonymous) payment, and reputation ratings. Indeed, PriParkRec service relies on well-known privacy-enhancing cryptographic building blocks (e.g., oblivious PRF, private set intersection, anonymous credentials, anonymous payment, and smart-contract, etc), these building blocks are carefully integrated together to achieve privacy and security goals to revolutionize the existing car-parking service system coming with the private blockchain and industrial internet of things (IIoTs) technologies.

中文翻译：

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PriParkRec：保护隐私的去中心化停车推荐服务


停车位不足和交通拥堵是我们城市生活中常见的重要问题。组织和管理可用停车位已经提高了很多意识。传统的集中式停车方法存在潜在的单点故障，并且不适合大型组织，因为经理的权力和责任负担过重。恶意服务提供商能够 (i) 跟踪公民的精确移动模式。 (ii) 收集数据以推断隐私敏感信息，例如停车请求者（即驾驶员）社交、工作和生活的地点； (iii) 分析轨迹以监控驾驶员的娱乐位置（例如，发现一夜情）。在不损害实体隐私的情况下设计一个去中心化的智能实用停车平台是智慧城市的紧迫问题。区块链（或分布式公共分类账技术）是集中式停车位推荐系统的近乎理想的去中心化和分布式解决方案。然而，现有的基于区块链的停车推荐解决方案大多忽视了在停车位检测和匹配阶段保护驾驶员的隐私，同时无法维护驾驶员的匿名性。本文提出了一种高效且保护隐私的停车位推荐服务平台，名为 PriParkRec，以及概念验证解决方案，以保护 PriParkRec 中请求者的隐私，同时保留当前停车位共享服务的大部分优点，即责任、（匿名）身份验证、（匿名）付款和声誉评级。事实上，PriParkRec 服务依赖于众所周知的隐私增强加密构建块（例如、不经意的PRF、私有集合交集、匿名凭证、匿名支付和智能合约等），这些构建块被仔细地集成在一起以实现隐私和安全目标，从而彻底改变现有的停车服务系统以及私有区块链和工业物联网 (IIoT) 技术。