A Medical Data Sharing Scheme Based on Blockchain Attribute-Based Searchable Encryption
Yan Li, Guo‐Feng Zhang, Bin Feng, Shihao Yang · 2024
Aiming at the problems of low sharing efficiency and easy privacy leakage of electronic medical records, a blockchain-based attribute-based searchable encrypted electronic medical record sharing scheme is proposed to achieve fine-grained access control of users' search privileges in one-to-many data sharing scenarios, and at the same time, solve the inefficiency of ciphertext retrieval. In this paper, the shared medical data is divided into structured and unstructured data, and the data is stored in a combined on-chain and off-chain mode, which ensures that both participate in the sharing at the same time, and also relieves the storage pressure of the blockchain. Attribute encryption based on ciphertext policy provides fine-grained access control services, and a data dictionary index structure is designed to complete ciphertext search in the index using searchable encryption. Blockchain nodes retrieve ciphertext keywords and search the index to improve the search efficiency of blockchain nodes. Experimental analysis shows that the scheme can quickly perform the search and sharing of electronic medical records.