Journal of Computer Applications ›› 2011, Vol. 31 ›› Issue (11): 2969-2972.DOI: 10.3724/SP.J.1087.2011.02969
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CHEN Qin,MA Dan-dan,ZHANG Jin-man,DANG Zheng-qin
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陈勤,马丹丹,张金漫,党正芹
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Abstract: In most attribute-based encryption schemes, access policy, which is used to encrypt message by encryptor, is often sent to the decryptor along with the ciphertext, but sometimes the policy itself is sensitive. This paper proposed a new construction to hide the access policy. During the encryption process, encryptor achieve the indistinguishability between the well-formed ciphertext components and the malformed. Compared with other constructions, ours was more efficient by reducing the times of exponent and pairing, and the sizes of ciphertext and keys were smaller. In addition, new attributes could be added in the ciphertext policy after setup was executed and the existing public parameters can remain unchanged. These analyses show the flexibility of construction. Security gets proved based on decisional bilinear Diffie-Hellman assumption.
Key words: Attribute-Based Encryption (ABE), ciphertext policy, access policy, authoriztion
摘要: 在属性基加密方案中,加密者通常把访问策略与密文一起发送给用户,但有时访问策略本身就是敏感信息,需要保密。提出一种新的较高效的匿名访问属性基加密方案,在加密过程中通过隐藏部分子集值以使授权用户有效密文和非授权用户无效密文不可区分,在对称双线性群组的基础上实现了访问匿名。与同类的匿名访问方案比较,新方案减少了双线性对和幂运算的次数,提高了算法的效率,并缩短了分析密文、密钥等的长度。分析结果表明,该算法可以在保持现有公共参数不变的情况下增加新的属性,增强了系统的灵活性。同时可证明新方案在双线性判定性假设下的安全性。
关键词: 属性基加密, 密文策略, 访问策略, 授权
CLC Number:
TP309.2
CHEN Qin MA Dan-dan ZHANG Jin-man DANG Zheng-qin. Attribute-based encryption scheme with hidden access policy[J]. Journal of Computer Applications, 2011, 31(11): 2969-2972.
陈勤 马丹丹 张金漫 党正芹. 隐藏访问策略的属性基加密机制[J]. 计算机应用, 2011, 31(11): 2969-2972.
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URL: http://www.joca.cn/EN/10.3724/SP.J.1087.2011.02969
http://www.joca.cn/EN/Y2011/V31/I11/2969