Medical Data Sharing Scheme Based on Blockchain-Based Attribute Proxy Re-Encryption
Mingliang Zhang, Li Li · 2023
Medical data is a kind of personal information with high value. In the traditional medical data management system, it is usually stored in a centralized database, which has problems such as single point of failure, invalid access policy, and difficulty in sharing. Aiming at the above problems, a blockchain-based medical data sharing scheme is proposed. First, use the consortium blockchain to ensure the integrity and transparency of medical data, and use the stealth address method to ensure the impossibility of doctor-patient contact, propose an attribute encryption and proxy re-encryption scheme with a hidden strategy to achieve fine-grained data Access Control Scheme. Combined with smart contracts, the revocation of access rights and the control of access time are realized to protect the privacy of patients. Secondly, in view of the problem of centralized single point of failure and the excessive load of blockchain storage in the process of data sharing, the solution is integrated with blockchain, smart contracts and interplanetary file systems to realize distributed storage of original data ciphertexts under the chain. Low overhead mode shared on-chain with key information ciphertext. Finally, through the security evaluation, it is proved that the scheme can guarantee the safe sharing of data. Through comparison with similar data sharing schemes and performance analysis experiments, the results show that this scheme has better efficiency under the premise of ensuring safe sharing.