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In order to solve the problem that most of the existing blockchain-based searchable encryption schemes only support exact keyword search and mutual distrust between the cloud server and the user, a searchable encryption scheme based on blockchain, that has functions such as file update dynamically, search results verification, fuzzy keyword search, and fair payment, is proposed. We use edit distance to generate the fuzzy keywords set. According to the un-modification characteristic of Ethereum<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1109/access.2020.3002264">doi:10.1109/access.2020.3002264</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/hyhxbkbsrfeofn6x5ckguq4l3y">fatcat:hyhxbkbsrfeofn6x5ckguq4l3y</a> </span>
more »... lockchain and the security of the RSA accumulator, our scheme can verify the search results by the smart contract and realize the service-payment fairness between the user and the cloud server. The security analysis shows that the proposed scheme achieves non-adaptive semantic security. Performance analysis and experiment show that our scheme is efficient and meets the demand of search application in the cloud environment. INDEX TERMS Ethereum blockchain, fuzzy keyword search, fair payment, searchable encryption. 109688 VOLUME 8, 2020
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