| 一类代理多重签名方案的密码学分析与改进 |
| |
| 引用本文： | 谢琪.一类代理多重签名方案的密码学分析与改进[J].浙江大学学报(理学版),2006,33(2):139-141,148. |
| |
| 作者姓名： | 谢琪 |
| |
| 作者单位： | 杭州师范学院,信息工程学院,浙江,杭州,310036;浙江大学,数学系,浙江,杭州,310027 |
| |
| 基金项目： | 中国科学院资助项目;浙江省自然科学基金 |
| |
| 摘 要： | 2001年，傅晓彤等提出了一种新的代理多重签名体制，即多个原始签名人分别将签名权力委托给各自的代理签名人，再由这些代理签名人联合生成代表所有原始签名人的数字签名．然而，周红生等（2004）指出他们的方案不存在抗抵赖性以及代理签名者能滥用代理签名权的缺陷，同时给出了一个改进方案．本文指出，周红生等的方案也是不安全的，任一原始签名人或任一代理人都能生成有效的代理多重签名，而且可以任意修改代理签名的期限．为克服他们的安全性弱点，给出了一个改进的方案．
|
| 关 键 词： | 数字签名 代理签名 代理多重签名 |
| 文章编号： | 1008-9497（2006）02-139-03 |
| 收稿时间： | 2004-07-27 |
| 修稿时间： | 2004-07-27 |
Cryptanalysis and improvement of a proxy multisignature scheme |
| |
| XIE Qi.Cryptanalysis and improvement of a proxy multisignature scheme[J].Journal of Zhejiang University(Sciences Edition),2006,33(2):139-141,148. |
| |
| Authors: | XIE Qi |
| |
| Affiliation: | 1. School of Information and Engineering, Hangzhou Teachers College, Hangzhou 310036, China; 2. Department of Mathematics, Zhejiang University, Hangzhou 310027, China |
| |
| Abstract: | In 2001,Fu et al.proposed a new proxy multisignature scheme,which means multi-original signers can delegate their signing capabilities to proxy signers respectively to create a proxy signature on behalf of all original signers.However,Zhou et al.(2004) showed that their scheme was insecure,the proxy signers can repudiate the proxy signature and can misuse the signing capabilities.Furthermore,they presented a modification scheme.However,we will show that their modification scheme is also insecure.Any original signer or proxy signer can forge a valid proxy signature,and the delegation time can be revised.To overcome the weakness,a modification to their proxy multisignature scheme can satisfy the security requirement. |
| |
| Keywords: | digitial signature proxy signatures proxy multi signature |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
