A More Efficient Attribute-Based Encryption Scheme With Hidden Access Structure Policy

Qian~Wang; Zhenfu~Cao

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A More Efficient Attribute-Based Encryption Scheme With Hidden Access Structure Policy

Qian~Wang 1, Zhenfu~Cao 2

1. East China Normal University, No.3663, Zhongshanbei Road, Shanghai, CN, 51151500133@sei.ecnu.edu.cn

2. East China Normal University, No.3663, Zhongshanbei Road, Shanghai, CN, zfcao@sei.ecnu.edu.cn

*Correspondence author

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Funding: the Specialized Research Fund for the Doctoral Program of Higher Education of China（No.20130073130004）

Opened online:12 May 2017

Accepted by: none

Citation: Qian~Wang, Zhenfu~Cao.A More Efficient Attribute-Based Encryption Scheme With Hidden Access Structure Policy[OL]. [12 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4729480

We propose two new ciphertext-policy attribute-based encryption schemes where the access structures defined by And-gate with wildcard are hidden. In the scheme1, we expand the scheme of Phuong so that it can be used in the situation of multi-valued attributes. In the scheme2, we use a new technique to reduce the length of ciphertext and the cost of decryption. By comparison with the scheme1 and phuong's scheme in the same situation, it proved that scheme2 is more efficient as both the length of the cipertext and the cost of the decryption are decreased by half. In our scheme, we use the technique of the notion of 'attributes' position' and 'attributes' possible values' to realize our scheme. Then we proof the selective security of scheme2 under the standard decisional linear and decisional bilinear Diffie-Hellman assumptions.

Keywords:Ciphertext-Policy Attribute-Based Encryptions, Wildcard, Multiple Attributes, Hidden Policy

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