Along with the progress of cloud service, a growing quantity of data owners store their data on cloud databases, which can not only reduce data owners’ storage cost but also provide a quick search function. However, while cloud storage brings some conveniences to users, new privacy problems may emerge, such as the leakage of data privacy and user’s query privacy. The best way of protecting data privacy is to encrypt the data. So how to efficiently retrieve the ciphertext to make it available becomes a hot issue in recent years. In this paper, new searchable encryption with multiple keywords is described, it can improve the accuracy of retrieval results, and we present a secure and trusted data sharing framework based on attribute-based encryption (ABE), searchable encryption, and blockchain. Unlike the previous studies, we realize flexible data sharing by using ABE. Furthermore, we transfer the related calculation of ciphertext retrieval to blockchain for credible execution without relying on any trusted third party. The security analysis proves that our method meets the proposed security requirements of data, keyword index, trapdoor, and query. Finally, the experimental results indicate that our scheme suggested has certain practicability and efficiency.

随着云服务的发展，越来越多的数据所有者将其数据存储在云数据库中，这不仅可以降低数据所有者的存储成本，而且可以提供快速搜索功能。但是，尽管云存储为用户带来了一些便利，但是可能会出现新的隐私问题，例如数据隐私和用户查询隐私的泄漏。保护数据隐私的最佳方法是对数据进行加密。因此，如何有效地检索密文以使其可用成为近年来的热门问题。本文描述了一种新的具有多个关键字的可搜索加密，它可以提高检索结果的准确性，并且我们提出了一种基于属性加密（ABE），可搜索加密和区块链的安全且受信任的数据共享框架。与之前的研究不同，我们使用ABE实现了灵活的数据共享。此外，我们将密文检索的相关计算转移到区块链以实现可靠的执行，而无需依赖任何受信任的第三方。通过安全性分析证明，该方法满足数据，关键字索引，活板门和查询的安全性要求。最后，实验结果表明，该方案具有一定的实用性和有效性。