西安电子科技大学通信工程学院,西安,710071
网络首发:2011-02-10,
纸质出版:2011
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杨旸 1, 胡予濮 1, 张乐友 2, 等. 标准模型下可证明安全的分级身份签名方案[J]. 西安交通大学学报, 2011,45(2):27-33.
Provable Secure Hierarchical Identity Based Signature Scheme in the Standard Model[J]. 2011, 45(2): 27-33.
为使分级身份签名方案能够获得高安全性并同时缩短签名长度、降低计算量
提出一种标准模型下可证明安全的分级身份签名方案.现有的方案通常在签名过程中将消息作为一个整体进行运算
而文中方案则对消息进行分段处理
使得方案不仅具有效率上的优势
同时在相同的效率级别上
安全性明显优于其他现有方案.方案的安全性优势体现在:安全性证明基于完全身份的标准模型
安全性规约于计算Diffie-Hellman(CDH)假设
并且CDH假设的安全性明显优于其他的困难假设而仅次于离散对数问题
因此方案具有较强的安全性.方案的效率优势体现在:签名长度为常数
验证过程只需要进行3次双线性对运算
用户私钥长度随着级数的增加而减少.性能分析和安全性分析表明
文中方案的安全性和效率均优于现有方案.
Aiming at the intrinsic problems in hierarchical identity based signature(HIBS)schemes
such as enhancing the security
shortening the signature length
and reducing the computational costs
a novel hierarchical identity based signature scheme is proposed. The available schemes always handle the message as an entirety in the signature process; while our scheme processes the message as segments so that the scheme is not only efficient but also achieves higher security level. The suggested scheme is more secure than the existing schemes since it is proved secure in the standard model over full identity adaptive chosen message attack
and its security is reduced to computational Diffie-Hellman(CDH)assumption. The hardness of CDH assumption is superior to the other assumptions except the discrete logarithm problem. The new scheme has some efficiency advantages over the available schemes: the size of the signature is a constant
verification requires only three bilinear pairing operations
and the private keys size shrinks as the identity depth increases. The efficiency and security analysis shows that the proposed scheme is more secure and efficient compared with the existing HIBS schemes.
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