一种隐藏访问结构的文件层次属性加密研究

基于文件层次结构的属性加密方案在云存储环境下是高效率、低存储的，但访问结构本身包含敏感信息，存在用户信息泄露、文件易被窃取的风险，针对这一问题提出了一种隐藏访问结构的文件层次属性加密方案。该方案在不影响加密解密效率的前提下提高了加密算法的安全性，并采用双因子身份认证机制实现了更安全高效的访问控制。该研究成果基于判定性双线性Diffie-Hellman假设，在标准模型下被证明是安全的。

Research on file hierarchy attribute encryption of hidden access structure

The attribute encryption scheme based on file hierarchy is efficient and low in the cloud storage environment, but the access structure itself contains sensitive information, there is the risk of user information leakage and easy to be stolen. Aiming at this problem, this paper proposed a file-level attribute encryption scheme with hidden access structure. The scheme improved the security of the encryption algorithm without affecting the encryption and decryption efficiency, and adopted a two-factor authentication mechanism to achieve a more secure and efficient access control. The results of the study are based on the deterministic bilinear Diffie-Hellman hypothesis, which is proved to be safe under the standard model.