Blockchain for Health IoT: A privacy-preserving data sharing system

Health Internet of Things (Health IoT) has been limited by isolated information and a lack of security. As the combination of blockchain and Health IoT could potentially address these two limitations, it has attracted significant interest. However, blockchain-based systems often fail to balance data sharing and privacy protection. Therefore, we proposed a Health IoT-based privacy-preserving data sharing blockchain system. We designed a privacy-preserving method based on the content extraction signature scheme to enable patients to establish fine-grained privacy protection. We designed a Byzantine fault-tolerant leader election mechanism that enhances the security of the Raft algorithm while providing efficiency in the data sharing. Furthermore, we designed a summary contract to ensure efficient data retrieval. The proposed mechanism was evaluated in terms of the efficiency and security. The simulation and analysis results demonstrate that our scheme offers a secure and effective technique for achieving privacy-preserving and efficient sharing of IoT medical data.