With the sharp increase in the number of intelligent devices, the Internet of Things (IoT) has gained more and more attention and rapid development in recent years. It effectively integrates the physical world with the Internet over existing network infrastructure to facilitate sharing data among intelligent devices. However, its complex and large-scale network structure brings new security risks and challenges to IoT systems. To ensure the security of data, traditional access control technologies are not suitable to be directly used for implementing access control in IoT systems because of their complicated access management and the lack of credibility due to centralization. In this paper, we proposed a novel attributebased access control scheme for IoT systems, which simplifies greatly the access management. We use blockchain technology to record the distribution of attributes in order to avoid single point failure and data tampering. The access control process has also been optimized to meet the need for high efficiency and lightweight calculation for IoT devices. The security and performance analysis show that our scheme could effectively resist multiple attacks and be efficiently implemented in IoT systems. INDEX TERMS Access control, attribute-based access control, blockchain, consortium blockchain, Internet of Things.
Diabetic foot is a common and severe chronic diabetic complication and has become a public health issue, 1 with the global prevalence of diabetic foot ulcer (DFU) being 6.3%. 2 Around 25% of patients with diabetes develop a foot ulcer in their lifetime, 3 and compared to nondiabetic patients, those with DFU have higher amputation rates and increased mortality. 4 Peripheral arterial disease, diabetic peripheral neuropathy, deformity, previous amputation, and infection are the main factors contributing to the development of DFU. 5 Hence, early identification of risk factors for the diabetic foot is especially important for its prevention and treatment.
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