辫群上代理签名体制的分析与设计*

为了研究抵抗量子分析的密码体制，对两种辫群上的代理签名体制进行分析，指出其不能抵抗已知签名的存在性伪造攻击；基于匹配共轭搜索问题的难解性构造了新的代理签名体制。分析表明该体制满足代理签名的各种安全需求，且计算效率高、签名长度短。

Analysis and design of proxy signature schemes over braid groups

In order to research quantum cryptanalysis-resistant cryptographic schemes,this paper pointed the security vulnerabilities of two proxy signature schemes over braid groups that they could not resist the known-signature existential forgery attack.Then proposed a new proxy signature scheme based on the difficulty of the matching conjugacy search problem.Analysis shows that the proposed scheme satisfies the security requirements of proxy signature and has high computing efficiency and a short signature.