Hierarchical Medical Services Data Sharing Scheme Based on Searchable Attribute Encryption

In the referral process of hierarchical medical services, it involves the problem of two-way medical data sharing services. In order to solve the problem of data security in this process, the article first uses an attribute proxy re-encryption scheme that supports keyword search to encrypt data, which enables both data sharing and data forwarding services, and also supports flexible access control, so that patients can flexibly control the target hospitals they want to refer to through attribute sets and initiate request services to the target hospitals, and the target hospitals that meet the patient's expectations can decrypt and view these requests and obtain the corresponding patient medical information at the time of treatment. In addition, using the decentralized feature of blockchain, we build a federation chain node in major hospitals and run smart contracts as a trusted authority center, which serves to store key information and perform cryptographic algorithms (e.g., public parameter generation, token generation, and other algorithms) and attribute verification, etc. The innovation of this paper is to create a safe and efficient data sharing model by taking hospital as node and combining searchable encryption and attribute encryption.