代理盲签名的研究及其在电子现金中的应用

发布时间：2018-01-22 07:25

本文关键词： 数字签名电子现金秘密值代理密钥代理授权盲性　出处：《华东交通大学》2016年硕士论文　论文类型：学位论文

【摘要】：计算机技术的快速发展,使人类进入到了信息化时代,电子商务等网络活动日益盛行,如何保障信息安全成为了一个重要的问题。对于数字签名的研究越来越多,因为其可以有效地保障信息安全。由于代理盲签名自身所具有的良好性质,使其能够广泛应用到电子现金系统中。本文只要是对现有的代理盲签名方案做出了改进,并对其在电子现金系统中的应用做了一定研究,主要如下:1.通过对一个基于身份的代理盲签名分析,发现其存在不能抵抗恶意攻击者伪造代理授权和PKG伪造签名的攻击,因为现实环境中的PKG并不总是安全的。因此通过为用户增加自己的秘密值信息的方式提出了一种新方案,避免了原有方案中不能抵抗恶意PKG攻击的问题。2.通过对一个无证书的代理盲签名分析,发现其存在公钥替换攻击和恶意但被动的KGC攻击。针对这些缺点,通过改变用户公钥生成过程和将用户身份信息与其公钥通过Hash函数绑定,提出了一个改进的方案,并证明了新方案是存在性不可伪造的,从而避免了原方案中存在的一些问题。3.通过分析一个无证书的代理盲签名方案的安全性,发现其存在恶意的KGC攻击,也存在普通攻击者的攻击,恶意KGC与原始签名者联合能够获得代理密钥。针对这些缺点,将用户的身份信息和公钥通过哈希函数绑定起来,并改变了签名过程,提出了一个新方案,有效的避免了原有方案中可能存在的问题。4.提出了一个电子现金方案并分析了其安全性,主要是将改进的无证书代理盲签名方案应用其中。
[Abstract]:With the rapid development of computer technology, human beings have entered the information age, electronic commerce and other network activities are increasingly popular. How to ensure information security has become an important issue. More and more research on digital signature, because it can effectively protect information security, due to the good nature of proxy blind signature itself. So that it can be widely used in the electronic cash system. In this paper, the existing proxy blind signature scheme has been improved, and its application in the electronic cash system has been studied. By analyzing an identity-based proxy blind signature, we find that it can not resist malicious attackers to forge proxy authorization and PKG forged signature attack. Because PKG in real environment is not always secure, a new scheme is proposed by adding secret value information to users. Avoid the original scheme can not resist the problem of malicious PKG attacks. 2. Through a certificate-free proxy blind signature analysis. It is found that there are public key replacement attacks and malicious but passive KGC attacks. In view of these shortcomings, by changing the public key generation process of the user and binding the user identity information to its public key through the Hash function. An improved scheme is proposed, and the existence of the new scheme is proved to be unforgeable, thus avoiding some problems in the original scheme. 3. The security of a certificateless proxy blind signature scheme is analyzed. It is found that there are malicious KGC attacks as well as attacks by ordinary attackers. Malicious KGC and original signers can obtain proxy keys. The user's identity information and public key are bound by the hash function, and the signature process is changed, and a new scheme is proposed. An electronic cash scheme is proposed and its security is analyzed. The improved blind signature scheme is mainly applied to the blind signature scheme without certificates.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TP309

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