Smart cities use the Internet of Things (IoT) devices such as connected sensors, lights, and meters to collect and analyze data to improve infrastructure, public utilities, and services. However, the true potential of smart cities cannot be leveraged without addressing many security concerns. In particular, there is a significant challenge for provisioning a reliable access control solution to share IoT data among various users across organizations. We present a novel entitlement-based blockchain-enabled access control architecture that can be used for smart cities (and for any ap-plication domains that require large-scale IoT deployments). Our proposed entitlement-based access control model is flexible as it facilitates a resource owner to safely delegate access rights to any entities beyond the trust boundary of an organization. The detailed design and implementation on Ethereum blockchain along with a qualitative evaluation of the security and access control aspects of the proposed scheme are presented in the paper. The experimental results from private Ethereum test networks demonstrate that our proposal can be easily implemented with low latency. This validates that our proposal is applicable to use in the real world IoT environments.

中文翻译：

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使用区块链的基于权利的智能城市访问控制

智慧城市使用物联网 (IoT) 设备（例如连接的传感器、灯和仪表）来收集和分析数据，以改善基础设施、公共事业和服务。然而，如果不解决许多安全问题，就无法利用智慧城市的真正潜力。特别是，提供可靠的访问控制解决方案以在跨组织的不同用户之间共享 IoT 数据是一项重大挑战。我们提出了一种基于区块链的新型访问控制架构，可用于智慧城市（以及任何需要大规模物联网部署的应用领域）。我们提出的基于权利的访问控制模型是灵活的，因为它有助于资源所有者将访问权限安全地委派给组织信任边界之外的任何实体。本文介绍了以太坊区块链的详细设计和实现，以及对所提出方案的安全性和访问控制方面的定性评估。来自私有以太坊测试网络的实验结果表明，我们的提议可以以低延迟轻松实现。这验证了我们的提议适用于现实世界的物联网环境。