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Enabling Reliable Keyword Search in Encrypted Decentralized Storage with Fairness

机译:在加密的分散存储空间中启用可靠关键字搜索

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摘要

Blockchain has led the trend of decentralized applications and shown great use beyond cryptocurrencies. Decentralized storage such as Storj and Sia leverages blockchain to establish an open platform for sharing economy, which provides private and reliable file-outsourcing services. However, the ubiquitous keyword search function over encrypted files is yet to be supported. To enable this function, we first apply searchable encryption techniques to the decentralized setting. But this primitive can hardly ensure the service integrity. The reason is that decentralized storage commonly faces severe threats from both clients and service peers. Service peers may return partial or incorrect results, while clients may intentionally slander the service peers to avoid payments. To address these threats, we utilize the smart contract to record the logs of encrypted search (aka evidence) on the blockchain, and devise a fair protocol to handle disputes and issue fair payments. Using a dynamic-efficient searchable encryption scheme as an instantiation, we craft a concrete scheme that preserves encrypted search capability and enforces ecosystem healthiness, so that service peers are incentivized to make real efforts and jointly guarantee service reliability. We implement our scheme in Python and Solidity, and test its search performance and transaction costs on Ethereum.
机译:BlockChain领导了分散应用的趋势,并显示了密码货币超越的巨大用途。分散存储如Storj和Sia利用区块链来建立一个开放的共享经济平台,提供私人和可靠的文件外包服务。但是,尚未支持过泛骨关键字搜索函数通过加密文件。要启用此功能,我们首先将可搜索的加密技术应用于分散的设置。但这原语可以很难确保服务完整性。原因是分散存储通常面临客户和服务同行的严重威胁。服务对等体可能会返回部分或不正确的结果,而客户则可能会故意诽谤服务对等体以避免付款。为了解决这些威胁,我们利用智能合同记录区块链上的加密搜索(AKA证据)的日志,并制定公平协议来处理争议并发出公平的付款。使用动态有效的可搜索加密方案作为实例化,我们制作了一个具体方案,这些方案保留了加密的搜索功能并强制执行生态系统的健康,以便激励服务对等体进行实际努力并共同保证服务可靠性。我们在Python和稳定性中实施我们的方案,并在以外人的情况下测试其搜索性能和交易成本。

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