With the rapid development of wireless sensor networks, smart devices, and traditional information and communication technologies, there is tremendous growth in the use of Internet of Things (IoT) applications and services in our everyday life. IoT systems deal with high volumes of data. This data can be particularly sensitive, as it may include health, financial, location, and other highly personal information. Fine-grained security management in IoT demands effective access control. Several proposals discuss access control for the IoT, however, a limited focus is given to the emerging blockchain-based solutions for IoT access control. In this paper, we review the recent trends and critical needs for blockchain-based solutions for IoT access control. We identify several important aspects of blockchain, including decentralised control, secure storage and sharing information in a trustless manner, for IoT access control including their benefits and limitations. Finally, we note some future research directions on how to converge blockchain in IoT access control efficiently and effectively.

中文翻译：

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物联网访问控制区块链：近期趋势和未来研究方向

随着无线传感器网络、智能设备以及传统信息和通信技术的快速发展，物联网 (IoT) 应用程序和服务在我们日常生活中的使用量大幅增长。物联网系统处理大量数据。这些数据可能特别敏感，因为它可能包括健康、财务、位置和其他高度个人化的信息。物联网中的细粒度安全管理需要有效的访问控制。一些提案讨论了物联网的访问控制，但是，对新兴的基于区块链的物联网访问控制解决方案的关注有限。在本文中，我们回顾了基于区块链的物联网访问控制解决方案的最新趋势和关键需求。我们确定了区块链的几个重要方面，包括分散控制、以无信任的方式安全存储和共享信息，用于物联网访问控制，包括其优点和局限性。最后，我们指出了一些未来的研究方向，即如何有效地将区块链融合到物联网访问控制中。