CP-ABE Scheme Based on Prime Group with Fully Hidden Access Structure

doi:10.3969/j.issn.1000-3428.2016.10.025

Abstract

Abstract: Existing Attribute-based Encryption(ABE) schemes with hidden access structures are only partially hidden,which will lead to privacy leaks.Therefore,this paper proposes a Ciphertext-policy Attribute-based Encryption(CP-ABE) scheme with fully hidden access structure in prime order group.In the proposed scheme,each attribute not only has a number of possible values,but also has a mark to describe the demanding status,which enriches the description of access structure.In addition,any user learns nothing about an access policy even if an authorized user can decrypt encrypted data successfully because he is forced to use all of his attribute components for decryption.The scheme is proven secure under sequences of games based on the Decisional Bilinear Diffie-Hellman(DBDH) assumption and Decision Linear(D-Linear) assumption.Finally,comparisons of the proposed scheme and the existing schemes are offered.The results show that the proposed scheme is more suitable for the application of high confidentiality requirements.

Key words: Attribute-based Encryption(ABE), access structure, privacy, Decisional Bilinear Diffie-Hellman(DBDH) assumption, Decision Linear(D-Linear) assumption, sequence of game

摘要： 现有多数隐藏访问结构的基于属性加密(ABE)方案只是部分隐藏,会导致隐私泄露。为此,在素数阶群中提出一个完全隐藏访问结构的密文策略ABE(CP-ABE)方案。在该方案中,每个属性不仅有多个可能的取值,而且还有一个描述属性需求状态的标记,丰富了访问结构的描述。此外,由于用户在解密时必须使用其所有属性元素,因此任何用户均无法获得访问结构信息。在判定双线性Diffie-Hellman和判定线性假设下,利用游戏序列方式证明方案的安全性,并与现有隐藏结构的ABE方案进行比较,结果表明,在对机密性要求比较高的应用中,该方案更具优势。

关键词: 基于属性加密, 访问结构, 隐私, 判定双线性Diffie-Hellman假设, 判定线性假设, 游戏序列

CLC Number:

TP309

LIU Xueyan,ZHENG Dengfeng. CP-ABE Scheme Based on Prime Group with Fully Hidden Access Structure[J]. Computer Engineering, doi: 10.3969/j.issn.1000-3428.2016.10.025.

刘雪艳,郑等凤. 基于素数群完全隐藏访问结构的CP-ABE方案[J]. 计算机工程, doi: 10.3969/j.issn.1000-3428.2016.10.025.

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References

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