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Electronic Medical Record (EMR) system based on the cloud has serious leaks of patient data and private information. Access control and privacy protection are considered to be the keys to ensuring the privacy of patients. Attribute-Based Access Control (ABAC) can realize fine-grained control of cloud medical data, but lacks the corresponding encryption mechanism. Moreover, as the scale of medical data grows, the number of entity attributes and policies required by ABAC is increasing, leading to performance degradation. Most of the existing research schemes focus on security but ignore efficiency, and the encryption scheme does not fit ABAC mechanism well. This paper proposed a retrieval method that enables attribute value, which filtered invalid policies, and improved Ciphertext-Policy Attribute-Based Encryption (CP-ABE), shared attribute set with ABAC to save attribute processing time, thus constructing a secure and efficient SE-ABAC solution in EMR system. Finally, through simulation experiment analysis, the optimizes solution is effective and more efficient than traditional ABAC.

Secure and Efficient Attribute-Based Access Control Optimization Scheme for EMR System