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Searchain: Blockchain-based private keyword search in decentralized storage

机译：Searchain：去中心化存储中基于区块链的私有关键字搜索

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Blockchain-based distributed storage enables users to share data without the help of a centralized service provider. Decentralization eliminates traditional data loss brought by compromising the provider, but incurs the possible privacy leakage in a way that the supplier directly links the retrieved data to its ciphertext. Oblivious keyword search (OKS) has been regarded as a solution to this issue. OKS allows a user to retrieve the data associated with a chosen keyword in an oblivious way. That is, the chosen keyword and the corresponding ciphertext are unknown to the data supplier. But if the retrieval privilege is with an authorized keyword set, OKS is unavailable due to one-keyword restriction and public key encryption with keyword search (PEKS) might lead to high bandwidth consumption. In this paper, we introduce Searchain, a blockchain-based keyword search system. It enables oblivious search over an authorized keyword set in the decentralized storage. Searchain is built on top of a novel primitive called oblivious keyword search with authorization (OKSA), which provides the guarantee of keyword authorization besides oblivious search. We instantiate a provably secure OKSA scheme, featured with one-round interaction and constant size communication cost in the transfer phase. We apply OKSA and ordered multisignatures (OMS) to present a Searchain protocol, which achieves oblivious peer-to-peer retrieval with order-preserving transaction. The analysis and evaluation show that Searchain maintains reasonable cost without loss of retrieval privacy, and hence guarantees its practicality.
机译：基于区块链的分布式存储使用户无需中央服务提供商的帮助即可共享数据。分散化消除了由破坏提供者带来的传统数据丢失，但是以供应商将检索到的数据直接链接到其密文的方式引起了可能的隐私泄漏。遗忘关键字搜索（OKS）已被视为解决此问题的方法。 OKS允许用户以忽略的方式检索与所选关键字关联的数据。即，所选择的关键字和相应的密文对于数据提供者而言是未知的。但是，如果检索特权带有授权的关键字集，则由于单关键字限制，OKS不可用，并且带有关键字搜索（PEKS）的公共密钥加密可能会导致高带宽消耗。在本文中，我们介绍Searchain，这是一种基于区块链的关键字搜索系统。它可以对分散存储中的授权关键字集进行遗忘搜索。 Searchain建立在一种称为“带授权的遗忘关键字搜索”（OKSA）的新颖原语的基础上，它提供了除遗忘搜索之外的关键字授权保证。我们实例化了一个可证明安全的OKSA方案，该方案在传输阶段具有单轮交互和恒定大小的通信成本。我们应用OKSA和有序多重签名（OMS）提出了Searchain协议，该协议通过保留订单的事务实现了对等的对等检索。分析和评估表明，Searchain保持合理的成本而不会丢失检索隐私，因此保证了其实用性。

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