In hybrid cloud computing, encrypted data access control can provide a fine-grained access method for organizations to enact policies closer to organizational policies. This paper presents an improved CP-ABE scheme to construct an encrypted data access control solution that is suitable for mobile users in hybrid cloud system. In our improvement, we split the original decryption keys into a control key, a secret key and a set of transformation keys. The private cloud managed by the organization administrator takes charge of updating the transformation keys using the control key. It helps to handle the situation of flexible access management and attribute alteration. Meanwhile, the mobile user's single secret key remains unchanged as well as the ciphertext even if the data user's attribute had been revoked. In addition, we modify the access control list through adding the attributes with corresponding control key and transformation keys so as to manage user privileges depending upon the system version. Finally, the analysis shows that our scheme is secure, flexible and efficient to be applied in mobile hybrid cloud computing.
This work was supported by the National Natural Science Foundation of China under Grant No. 61502044, and the Fundamental Research Funds for the Central Universities of China under Grant No. 2015RC23.
About author: Wen-Min Li received her B.S. and M.S. degrees in mathematics and applied mathematics from Shaanxi Normal University, Xi'an, in 2004 and 2007, respectively, and her Ph.D. degree in cryptology from Beijing University of Posts and Telecommunications, Beijing, in 2012. She is currently a post-doctoral researcher in Beijing University of Posts and Telecommunications, Beijing.
Wen-Min Li, Xue-Lei Li, Qiao-Yan Wen, Shuo Zhang, Hua Zhang.混合云系统中面向移动用户基于CP-ABE实现的加密数据灵活访问控制[J] Journal of Computer Science and Technology , 2017,V32(5): 974-990
Wen-Min Li, Xue-Lei Li, Qiao-Yan Wen, Shuo Zhang, Hua Zhang.Flexible CP-ABE Based Access Control on Encrypted Data for Mobile Users in Hybrid Cloud System[J] Journal of Computer Science and Technology, 2017,V32(5): 974-990
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