An encrypted medical blockchain data search method with access control mechanism

The use of medical blockchain enables the safe sharing of electronic medical data (EMD). With the continuous growth of EMD, how to efficiently find EMD on the medical blockchain is a very challenging problem. In this paper, we propose an encrypted medical blockchain data search method with an access control mechanism. Firstly, we elaborate on the importance of medical blockchain data search, access control, and encryption to enhance our research motivation. Secondly, we detail the implementation process and security analysis of our method. Finally, the experimental results on Ethereum, nonrelational database MongoDB, and real public medical data show that compared with previous work, the proposed method can improve search efficiency while preserving privacy.