计算机应用 ›› 2010, Vol. 30 ›› Issue (4): 1030-1032.

• 信息安全 • 上一篇    下一篇

基于辫群的代理签名方案的分析与改进

黄文平1,宁菊红2   

  1. 1. 南昌陆军学院
    2. 江西师范大学
  • 收稿日期:2009-10-30 修回日期:2009-12-08 发布日期:2010-04-15 出版日期:2010-04-01
  • 通讯作者: 宁菊红
  • 基金资助:
    江西省自然科学基金;江西省教育厅科研计划项目

Analysis and improvement of proxy signature schemes over braid group

  • Received:2009-10-30 Revised:2009-12-08 Online:2010-04-15 Published:2010-04-01

摘要: 对两个基于辫群的代理签名方案进行了分析,发现它们并不满足不可伪造性。第一个方案中不能抵抗原始签名人改变攻击,在第二个方案中任何攻击者可以伪造一个有效的代理签名,在该签名中,代理签名者以及消息可以任意指定。根据上述缺陷,提出一个改进的强代理签名方案, 新方案在不增加计算复杂性的前提下,保证了签名的安全性,同时代理授权过程中还增加了不需要安全通道的性质。

关键词: 辫群, 代理签名, 伪造攻击, 安全分析, 共轭查找问题

Abstract: Analysis shows that two proxy signature schemes based on braid groups are insecure: the first scheme cannot resist the original signer’s change attack; in the scheme of second, any antagonist can successfully forge a valid proxy signature scheme, which the antagonist can designate any proxy signer and messages. Later, a new proxy signature scheme was proposed. Analysis shows that the proposed scheme satisfies all security requirements; what’s more, no security channel is in need in the communication of the original signer and the proxy signer.

Key words: braid group, proxy signature, forgery attack, security analysis, conjugacy search problem