具有两个可撤销属性列表的密钥策略的属性加密方案

Revocable Key-policy Attribute-based Encryption Scheme with Two Revocation Lists

可撤销的属性加密方案是属性加密方案的延伸和扩展。该文构造了细粒度属性撤销下的具有两个可撤销属性列表的密钥策略的属性加密方案,该方案是对含有单个属性撤销列表方案的推广,新方案涉及两个属性撤销列表,允许两个列表中被撤销用户存在交集或者无关,同时利用追踪算法,判定了用户与私钥的关联性。在选择安全模型下证明了方案的安全性,将方案的安全性规约到求解判定性双线性Diffie-Hellman指数问题上。

Revocable attribute-based encryption is an extension and generalization of attribute-based encryption. In this paper, a revocable key-policy attribute-based encryption scheme is constructed with two revocation lists, it extends a previous scheme which is designed with only one attribute revocation list, and in the new scheme two attribute revocation lists are involved, and the two lists are independent with each other. What＇s more, the new scheme enjoys an important property that the trace algorithm return the user associated with this decryption key. Finally, under the assumption of decisional Bilinear Diffie-Hellman Exponent（BDHE）, the proposed scheme is proved that is secure in the selective security model.