IoT technology has been widely valued and applied, and the resulting massive IoT data brings many challenges to the traditional centralized data management, such as performance, privacy, and security challenges. This paper proposes an IoT data access control scheme that combines attribute-based encryption (ABE) and blockchain technology. Symmetric encryption and ABE algorithms are utilized to realize fine-grained access control and ensure the security and openness of IoT data. Moreover, blockchain technology is combined with distributed storage to solve the storage bottleneck of blockchain systems. Only the hash values of the data, the hash values of the ciphertext location, the access control policy, and other important information are stored on the blockchain. In this scheme, smart contract is used to implement access control. The results of experiments demonstrate that the proposed scheme can effectively protect the security and privacy of IoT data and realize the secure sharing of data.

中文翻译：

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一种结合基于属性的加密和区块链的细粒度物联网数据访问控制方案

物联网技术得到了广泛的重视和应用，由此产生的海量物联网数据给传统的集中式数据管理带来了诸多挑战，如性能、隐私和安全方面的挑战。本文提出了一种结合基于属性的加密（ABE）和区块链技术的物联网数据访问控制方案。利用对称加密和ABE算法实现细粒度的访问控制，确保物联网数据的安全性和开放性。而且，区块链技术与分布式存储相结合，解决了区块链系统的存储瓶颈。只有数据的哈希值、密文位置的哈希值、访问控制策略等重要信息存储在区块链上。在该方案中，使用智能合约来实现访问控制。