Electronic medical record sharing scheme based on searchable attribute encryption in blockchain

In the medical field, the rapid development of cloud computing has brought many advantages to medical record data sharing. However, there are still problems such as lack of patient control over personal medical record data, privacy leakage and inefficient sharing. To address these challenges, an electronic medical record sharing scheme based on searchable attribute encryption in blockchain is proposed. Based on the attribute encryption algorithm, the scheme allows patients to independently set their medical record access policies according to their personal needs, realizes fine-grained access control of medical record data, and combines blockchain and searchable encryption technology to realize the multi-keyword search function, which improves the security and search efficiency of medical record data. Secondly the scheme designs an attribute revocation algorithm so that users can update the sharing privileges in time to ensure the security and privacy of medical record data. Finally, after security analysis and experimental verification, the scheme is able to realize the secure sharing of patients' personal electronic medical records with low computational overhead under the premise of protecting patients' privacy.