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| Traceable Ciphertext-policy Attribute-based Encryption Scheme with Constant Decryption Costs |
| WANG Jianhua① WANG Guangbo② XU Yang① HU Yixiao② ZHANG Yue② FAN Liwen② |
①(Electronic Technology Institute of Air Force, Beijing 100195, China)
②(31008 Force, Beijing 100036, China) |
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Abstract This paper puts forward a traceable Ciphertext-Policy Attribute-Based Encryption (CP-ABE) scheme for Monotone Access Structure (MAS), which is proved secure adaptively in the standard model by using composite order bilinear groups. To date, for all traceable CP-ABE schemes, the MAS is represented by the Linear Secret Sharing Scheme (LSSS) and then the data are encrypted by using the corresponding LSSS matrix. Therefore, their encryption costs are linear with the size of the LSSS matrix, and the decryption costs are linear with the number of qualified rows in the LSSS matrix. However, in the proposed traceable CP-ABE scheme, the MAS is represented by the set of minimal authorized set and then the data are encrypted by using the corresponding set. Therefore, the encryption costs are polynomial with the number of minimal authorized set, and for some access policies, the proposed scheme may have shorter ciphertext and lower encryption costs. In addition, the most important thing is that the proposed decryption needs only three bilinear pairing computations and two exponent computations, which improves the efficiency extremely. Finally, the full security proof of the proposed scheme is given by using three static assumptions along with the detailed performance analysis and experiment validation.
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Received: 06 March 2017
Published: 29 January 2018
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| Fund:The National 973 Program of China (2013CB 338001) |
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Corresponding Authors:
WANG Guangbo
E-mail: 691759571@qq.com
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