EMR sharing system with lightweight searchable encryption and rights management

The blockchain-based Electronic Medical Record (EMR) data storage system encounters challenges such as data leakage, insufficient access control, and low retrieval efficiency. In response to these issues, this paper proposes a lightweight searchable encryption and access control system for shared EMR data. The searchable encryption scheme is constructed using BGG13 + and MP12. The lightweight design is achieved by integrating the trapdoor verification phase with the keyword retrieval phase. User access control is implemented through a Boolean circuit. Simulations and experiments demonstrate that the system presented in this paper surpasses related studies. In addition, this paper adopts the Bloom filter as the system index to enhance the efficiency of block-chain data retrieval. Experimental results indicate that the index structure can boost data retrieval speed by 30%-50%.