标准模型下基于身份的签名方案

在标准模型下构建安全高效基于身份的签名方案是目前密码学领域的热点研究问题之一。提出并实现一个标准模型下基于身份的签名方案,其安全性依赖于截断的确定性q-ABDHE假设,并被证明是选择ID-CMA安全的,且具有紧规约,同时该方案的公共参数及签名长度皆为常数级。通过与典型方案对比可知,该方案在参数及签名长度、签名用时以及模型复杂度和易实现性等方面具有一定的优势。而实验结果则表明,该方案在对不同类型文件进行签名操作时有着良好的性能表现,签名所用时间与签名文件大小呈线性变化关系。

IDENTITY-BASED SIGNATURE SCHEME IN STANDARD MODEL

It is one of the hottest topics in today’s cryptography to construct a secure and efficient identity-based signature(IBS) scheme in standard model.In this paper,we present and implement a new IBS scheme in standard model,which security property depends on the truncated decisional q-ABDHE assumption and is proved to be choosing ID-CMA secured with tight reduction.Furthermore,the lengths of public parameters and signature of the scheme are all in constant size.Comparing other classic IBS schemes with ours in terms of performance and secure model,the scheme presented in the paper has certain predominance in those areas including the lengths of public parameters and signature,the time of signing,the complexity of model and the easiness in realisation.And the experimental results indicate that this scheme performs well in operation of signature on files of different types,and its time cost in signature is in linear relationship to the size of the file.