| 摘要: |
| 应用现实生活中"分权"的思想和(t,n)门限群签名技术,提出一种改进的无需可信任第三方的时控代理签名方案.该方案在对签名时间验证服务上,不再由一个可信的第三方来提供,而是由一个群体(t个人)来对代理签名时间和待签名的消息实行二级签名,能够避免(t,n)门限群签名时消息浏览权被扩大化和防止消息被泄密,除了满足代理签名的所有性质外,还能确定代理人签名的准确时间,当代理权被滥用时,授权人还可以将代理权撤销. |
| 关键词: 代理签名 门限群签名 可信中心 时间标志 |
| DOI： |
| 投稿时间：2007-03-18修订日期：2007-09-27 |
| 基金项目: |
|
| An Improved Time Stamped Proxy Signature Scheme without a Trusted Party |
|
LAI Yong-dong1,2, ZHONG Cheng1
|
| (1.School of Computer and Electronics and Information, Guangxi University, Nanning, Guangxi, 530004, China;2.Social Insurance Bureau of Guangxi, Nanning, Guangxi, 530022, China) |
| Abstract: |
| By the concept of decentralized power in real life and (t,n) threshold multi signature, an improved time stamped proxy signature scheme without a trusted party is presented. In this paper, the verification server of time stamped is offered not by a trusted party but by (t,n) threshold multi signature. In the meantime, to avoid the messages are read by non authorization, the time-stamped and messages are signed on two levels. First, the time stamped is signed by the threshold multi-signature scheme.Then the messages with time stamped are signed by proxy. This presented scheme satisfies all the security requirements for proxy signature. A verifier also can ascertain the proxy time.Moreover,the original signer can revoke delegations whenever necessary. |
| Key words: proxy signature threshold multi-signature trusted authority time stamp |
