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目前已提出的代理签名方案存在两个问题,首先缺乏在完整的代理签名安全模型下证明方案的安全性;其次一些安全性可归约于CDH问题或者其他问题的方案都含有双线性对的计算,由于双线性对的计算需要较多的时间,因此这些方案的计算性能不高.本文在EDL签名方案的基础上提出一种新的代理签名方案—Proxy-EDL签名方案,该方案是对EDL签名方案的扩展,方案中没有双线性对的计算,具有较高的计算性能,同时新方案在代理签名安全模型下被证明具有在自适应选择消息攻击下存在代理签名不可伪造性,其安全性可归约于CDH问题.与目前已有的代理签名方案相比,本文的代理签名方案具有更高的安全性和更好的计算性能.
At present, there are two problems with the proposed proxy signature scheme. First, it lacks to prove the security of the scheme under a complete proxy signature security model. Second, some schemes that can be safely reduced to CDH or other problems contain bilinear pairs Calculation, the calculation of bilinear pairings requires more time, so the computational performance of these schemes is not high.This paper proposes a new proxy signature scheme-Proxy-EDL signature scheme based on the EDL signature scheme, which is For the extension of the EDL signature scheme, there is no bilinear pair calculation in the scheme, which has higher computational performance. At the same time, the new scheme is proved to have the unforgeability of proxy signature under the attack of the proxy-selective message under the proxy signature security model, Its security can be reduced to the CDH problem.Compared with the existing proxy signature scheme, the proxy signature scheme in this paper has higher security and better computational performance.