论文标题:代理签名的研究与改进
The Research and Improving of Proxy Signature
论文作者
论文导师 王丽君,论文学位 硕士,论文专业 计算机应用技术
论文单位 辽宁科技大学,点击次数 95,论文页数 72页File Size3348K
2007-03-17论文网 http://www.lw23.com/lunwen_612664937/
Elliptic curve; Proxy signature; Proxy multi-signature
本文主要研究代理签名方面的有关问题。代理签名是一种特殊的数字签名，是原始签名人将自己的签名能力或签名权委托给代理签名人，由代理签名人代表原始签名人对所指定的文档进行签名来完成签名任务。它与数字签名的最大不同是在原始签名人和签名接收人之间增加了代理签名人这一中间环节。 在现实世界中，代理签名是一种常见的实践活动，其表现形式多样，应用领域广泛。本文对传统的代理签名方案进行了系统的研究，并且在以下几个方面作了主要工作： (1) 分析现有的、对学科发展有重要意义的两个典型代理签名方案，指出不同方案中可能存在的漏洞。这两个方案中存在不能阻止滥用权利或者存在伪造攻击以及效率低等缺陷，本文给出了攻击和破解过程。 (2) 为了保护原始签名人的隐私，提出了一种消息保密的代理签名方案，在代理授权过程中，原始签名人通过盲签名的方法把消息和其他代理授权参数一起传递给代理签名人，该方案能够保证除了指定的消息接收人外，其他人无法了解消息内容，在一些特殊的应用中，原始签名人希望在代理签名中隐藏代理签名人的身份，消息接收者无法从代理签名中识别代理人身份，在出现争议时，可以揭示代理人身份，该文提出的方案能够满足上述两种要求。 (3) 在纪家慧和李大兴的基于椭圆曲线离散对数问题的代理多重签名体制的基础上提出了两个伪造攻击，并对该方案进行了改进，提出了一种防止伪造攻击的方案。针对该方案的不足，该文在不引入第三方的情况下提出了一种更为安全而简洁的代理多重签名方案。 (4) 结合了代理签名和多重签名的优点，利用基于椭圆曲线上的Weil配对的双线性映射和零知识证明思想，在椭圆曲线数字签名基础上，构造了一种新型的代理多重签名方案，并对其安全性进行了分析。
This paper is mainly focused on the project in aspect of proxy signature. Proxy signature is a special class of digital signatures which allows an original signer to delegate his signature capability or signature right to a designated person who is called a proxy signer to sign on specified documents on behalf of the original signer. The primary difference between proxy signature and digital signature is that there is an intermediate component, which is called proxy signer between original signer and signature receiver, is added in proxy signature.In real world, proxy signature is an ordinary familiar practical activity. We studied the traditional proxy signature, and the following is our main creative research works:(1)We analysis two typical proxy signature schemes, which have important significance for the development of this study field, show attack scenarios against these schemes.(2)A proxy signature scheme was proposed to protect original signer"s privacy. In delegation authorization, the original signer encrypts the message and other delegating parameters to the proxy signer. The scheme ensures that the proxy signer and others except the valid receiver can not get any information from the message. In special application, the original signer wants to conceal the identity of the corresponding proxy signer in the proxy signature. The receiver can not recognize the identity of the proxy signer from the proxy signature. In the case of a later dispute, the original signer can reveal the real identity of the proxy signer with the help of the original signer from the proxy signature. In the paper, a new proxy signature scheme should satisfy this requirement.(3)We presented two forgery attacks on a proxy multi-signature scheme based on elliptic curves discrete logarithm problem proposed by Ji and Li. Furthermore, they presented a new modified and secure scheme to prevent the two forgery attacks. In this paper, a more secure and compact proxy multi-signature scheme which without the participant of third party has been proposed.(4)In this paper, we have the excellences of bilinear projection of weil-pairing and zero-knowledge proof. On the basis of elliptic curve signature, we presents a new proxy
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