Data Verifiable Personalized Access Control Electronic Healthcare Record Sharing Based on Blockchain in IoT Environment

Electronic health records (EHRs) based on the Internet of Things (IoT) can provide real-time health data for quick intelligent medical services and give convenience to many data-sharing scenarios. However, EHRs also face various security threats since they are highly private. To the best of our knowledge, no recognized data-sharing work can satisfy the stringent privacy requirements of EHRs. Motivated by this, we propose a blockchain-based personalized access control EHR-sharing scheme with data verifiability, which can safeguard the interests of data owners (DOs) and users simultaneously. First, we take ciphertext-policy attribute-based encryption to achieve personalized access control for DOs. Second, we design an interactive zero-knowledge proof protocol between DOs and users, which can provide authenticity verification of EHR for users and prevent EHR away from forgery. In addition, smart contracts and the interplanetary file system are used to reduce the computation and storage costs of patients. Finally, the security analysis shows that the proposed scheme meets the predefined security goals. The performance analysis demonstrates that the proposed scheme is efficient and can be applied to practical electronic medical record sharing scenarios.