LAUSR

With the assistance of Internet of Things (IoT), the fast developing Healthcare Internet of Things (H-IOT) have promoted the healthcare ecosystem into the era of Health 5.0 and enables many promising medical applications, such as remote healthcare that is crucial in pandemic (e.g, COVID-19). Healthcare participants can make accurate diagnosis, treatment and research based on the shared Personal Health Records (PHRs) sensed from remote H-IOT devices. However, current H- IOT systems fall short of a secure and trustworthy PHR sharing service in remote healthcare, which is able to prevent user privacy leakage and PHR violation together with high efficiency in key distribution apart from supporting efficient data retrieval and fine-grained access control. In response, we present a blockchain- based hierarchical data sharing framework (BHDSF) to provide fine-grained access control and efficient retrieval over encrypted PHRs with low consumed hierarchical key distribution and key leakage resistance. Compared with existing solutions, BHDSF takes untrusted cloud and malicious auditor into consideration simultaneously, and achieves trustworthy PHR integrity auditing and metadata verification by leveraging blockchain technique. Besides, BHDSF enables efficiently aggregative authentication for source records from H-IoT devices, which is lacked in most of existing data sharing frameworks. Finally, we demonstrate the feasibility of BHDSF by conducting extensive empirical tests over real-world dataset. IEEE