Attribute encryption based blockchain electronic medical record traceability method

The current traceability methods for electronic medical record data face three primary challenges. Firstly, prevailing data privacy protection strategies predominantly rely on traditional asymmetric encryption technology, which, however, falls short in achieving fine-grained access control. This limitation complicates the tracking of dynamic data sharing. Secondly, existing encryption approaches often employ linear encryption for single processes, resulting in slow encryption and decryption rates for large storage space files, such as medical image data. Lastly, a substantial heterogeneity exists among blockchain platforms utilized by different hospitals, posing obstacles to seamless data sharing and exchange and contributing to the creation of data silos.This paper proposes an innovative electronic medical record data traceability method based on attribute encryption to address the aforementioned issues. The method employs attribute encryption to regulate ciphertext access, enabling dynamic sharing of private data. Simultaneously, the performance of traditional attribute encryption schemes is enhanced, and a fragment algorithm is introduced to accelerate the encryption and decryption processes for large files. Additionally, a blockchain cross-chain middleware is designed to facilitate data sharing between heterogeneous blockchains.