基于混合加密技术的数据共享方法研究

With the increasing importance of digital resources, effective sharing and collaborative work of data can create greater data value in a diversified society. Therefore, this paper proposes a data sharing method based on hybrid encryption system. The method uses SM4 to encrypt and decrypt shared data, ensuring encryption and decryption efficiency while maintaining data privacy; implement fine-grained access control for shared data retrieval information using CP-ABE with hidden access policy, and extend the flexibility of access policies through LSSS; store shared data ciphertext in IPFS, and upload shared data retrieval information to blockchain for distributed storage to avoid single point of failure issues. Through security analysis and experimental simulation, this method has been shown to effectively ensure the confidentiality, integrity, and tamper-proof nature of shared data, and it demonstrates superior performance in scenarios involving large volumes of data.