| 对一种无证书代理签名方案的分析与改进 |
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| 引用本文： | 刘晓红,张建中.对一种无证书代理签名方案的分析与改进[J].计算机工程与应用,2014(22):115-117,140. |
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| 作者姓名： | 刘晓红 张建中 |
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| 作者单位： | 陕西师范大学 数学与信息科学学院,西安,710062 |
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| 基金项目： | 国家自然科学基金(No.61173190，No.61273311)；陕西省自然科学基础资助项目(No.2010JQ8027)；陕西省教育厅科研计划项目(No.2010JK398，No.12JK1003)；中央高校基本科研业务费专项基金资助项目(No.GK201002041)；陕西师范大学研究生培养创新基金(No.2013CXS024)。 |
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| 摘 要： | 分析了一种无证书代理签名方案,指出其针对于无证书密码系统中的两类敌手都不安全。类型I敌手可替换用户的公钥来伪造代理授权和代理签名;类型II敌手(KGC)可针对预先选择好的用户生成特殊的系统参数,然后伪造代理授权。为了克服这些安全问题,提出了一种改进的方案,分析表明,新方案具有更好的安全性。
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| 关 键 词： | 无证书签名 代理签名 公钥替换攻击 恶意的KGC攻击 双线性对 |
Analysis and improvement of certificateless proxy signature scheme |
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| LIU Xiaohong,ZHANG Jianzhong.Analysis and improvement of certificateless proxy signature scheme[J].Computer Engineering and Applications,2014(22):115-117,140. |
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| Authors: | LIU Xiaohong ZHANG Jianzhong |
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| Affiliation: | (College of Mathematics and Information Science, Shaanxi Normal University, Xi＇an 710062, China) |
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| Abstract: | This paper analyzes a certificateless proxy signature scheme and points out it are vulnerable against two types of adversaries in certificateless cryptosystems. Type I adversary can replace the user’public key to forge proxy delega-tions from any original signer to any proxy signer and compute the proxy signature;type II adversary（KGC）can generate the trapdoor system parameters according to the identity information of a pre-selected target user and then forge the proxy delegations from the target user to other users. To overcome these security problems, a new improved proxy signature scheme is proposed. Analysis shows that the new scheme has better security. |
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| Keywords: | certificateless signature proxy signature public key replacement attacks malicious KGC attacks bilinear mapping |
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