On-line/off-line proxy re-signatures

被引：0
作者：
Lan, Caihui [1 ]
Wang, Caifen [1 ]
Yang, Xiaodong [1 ]
机构：
[1] College of Computer Science and Engineering, Northwest Normal University, Lanzhou
来源：
Journal of Convergence Information Technology | 2012年 / 7卷 / 23期
关键词：
Chameleon hash function; Discrete logarithm; On-line/off-line proxy re-signature;
D O I：
10.4156/jcit.vol7.issue23.7
中图分类号：
学科分类号：
摘要：
To improve the real-time efficiency of proxy re-signatures, a new primitive called on-line/offline proxy re-signatures is introduced in this paper. The idea is to split the re-signing procedure into two phases: the off-line and on-line phases. Most of the computations are carried out in the off-line phase while the on-line phase does not require any heavy computations such as exponentiations or pairings. It is particularly suitable for a scenario where the proxy must respond quickly once the message to be re-signed is presented. We propose a generic on-line/off-line proxy re-signature scheme, which can convert any existing secure proxy re-signature scheme into a highly efficient on-line/off-line proxy re-signature scheme. The on-line phase of our scheme is very efficient: computing a re-signature takes one modular subtraction and one modular multiplication. Our scheme is proven secure based on the discrete logarithm assumption and the unforgeability of the underlying proxy re-signature scheme.
引用
收藏
页码：49 / 56
页数：7
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