This paper introduces a decentralized ride-sharing system called BRIP that utilizes blockchain technology. BRIP addresses various issues commonly associated with centralized ride-sharing such as single points of failure, privacy violations, lack of security and transparency, and distributed denial of service (DDoS) attacks, by utilizing the blockchain. It also integrates the Interplanetary File System (IPFS) with blockchain to move ride-sharing data from the blockchain to the IPFS and retaining only a compact IPFS hash for storage. This integration resolves the scalability challenges associated with storing and handling large volumes of ride-sharing data on the blockchain. However, the use of blockchain technology alone, even with IPFS integration, does not guarantee complete solutions for privacy, security, transparency, and trust. Therefore, to ensure security and privacy in BRIP, ride-sharing data is encrypted before being stored in the IPFS and blockchain, as well as processing these data. This paper also implements pseudonyms, unlinkability, and encryption techniques to protect users' privacy. To establish trust among users and ensure transparency of all ride-sharing transactions, we proposed an enhanced methodology by leveraging the capabilities of blockchain technology and smart contracts. This methodology is also designed in a way that helps in privacy-preservation, trust, and transparency. Furthermore, the trade-off between privacy-preservation is still a challenge in blockchain-based ride-sharing systems, which is resolved through semantic matching. Therefore, the paper proposes two semantic models, COR2Vec and customized Time2Vec, to accurately and semantically match, spatially and temporarily respectively, users while preserving their privacy. Finally, experimental results demonstrate the effectiveness and efficiency of the proposed BRIP system.

中文翻译：

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BRIP：建立一个保护隐私、值得信赖、透明的乘车共享系统，具有由区块链和 IPFS 支持的语义匹配功能

本文介绍了一种名为 BRIP 的分散式乘车共享系统，该系统利用区块链技术。 BRIP 利用区块链解决了与集中式拼车相关的各种常见问题，例如单点故障、侵犯隐私、缺乏安全性和透明度以及分布式拒绝服务 (DDoS) 攻击。它还将星际文件系统（IPFS）与区块链集成，将乘车共享数据从区块链转移到 IPFS，并仅保留紧凑的 IPFS 哈希进行存储。这种集成解决了与在区块链上存储和处理大量乘车共享数据相关的可扩展性挑战。然而，单独使用区块链技术，即使与 IPFS 集成，也不能保证隐私、安全、透明度和信任的完整解决方案。因此，为了确保 BRIP 的安全性和隐私性，拼车数据在存储到 IPFS 和区块链以及处理这些数据之前会被加密。本文还实现了假名、不可链接和加密技术来保护用户的隐私。为了在用户之间建立信任并确保所有乘车共享交易的透明度，我们通过利用区块链技术和智能合约的功能提出了一种增强的方法。该方法的设计方式还有助于保护隐私、信任和透明度。此外，隐私保护之间的权衡仍然是基于区块链的乘车共享系统中的一个挑战，这可以通过语义匹配来解决。因此，本文提出了两种语义模型：COR2Vec 和定制的 Time2Vec，分别在空间和临时上准确地语义匹配用户，同时保护用户的隐私。最后，实验结果证明了所提出的 BRIP 系统的有效性和效率。