Abstract:

The traditional searchable symmetric encryption solved the retrieval problem of encrypted data in cloud storage, but failed to consider the fairness of retrieval, that is, the server did not return the retrieval results or return wrong results after the user paid the service fee. With the emergence of blockchain, searchable symmetric encryption scheme based on bitcoin was proposed, but the transaction cycle of bitcoin system was long, and the scripting language of bitcoin was not complete, so it could not be applied to more scenarios. Therefore, a searchable symmetric scheme based on ethereum blockchain and smart contract is proposed, which ensures the privacy of data and realizes the fairness of retrieval. The results of safety and efficiency analysis show that the scheme is feasible.

Key words: searchable symmetric encryption, blockchain, ethereum, smart contract, fairness

摘要：

传统的对称可搜索加密解决了云存储中加密数据的检索问题，但是没有考虑到检索的公平性问题，即用户在支付了服务费后服务器没有返回检索结果或返回错误的检索结果的情况。随着区块链的出现，基于比特币的对称可搜索加密方案被提出，但是比特币系统的交易周期长，且比特币的脚本语言不是图灵完备的，不能适用于更多的场景。因此提出基于以太坊区块链和智能合约的对称可搜索加密方案，在保证数据隐私性的同时，解决了检索的公平性问题。安全性和性能分析结果表明该方案是可行的。

关键词: 对称可搜索加密, 区块链, 以太坊, 智能合约, 公平性