【作者】 牟晓青；

【导师】 徐秋亮；

【作者基本信息】 山东大学 ， 计算机软件与理论， 2007， 硕士

【摘要】 随着internez的快速发展，电子商务作为一种新的商务模式吸引了越来越多的注意力，对电子商务而言，电子支付系统是至关重要的。电子现金又是一种非常重要的电子支付系统。论文重点研究如何将现代密码学技术—群签名技术、盲签名技术、盲群签名技术应用到一个重要的电子支付系统—电子现金系统中。论文的研究分两部分：一是群签名，盲签名，盲群签名的研究；二是电子现金系统的研究。(1)群签名、盲签名以及由它们派生出来的盲群签名是目前现代密码技术研究的几个热点，它们不论在政治领域、军事领域，还是在商业领域都具有广泛的应用。例如它们可以用在电子选举、电子投票以及电子现金等许多电子政务和电子商务活动中。本论文对三者进行了较为深入的研究，针对LR98盲群签名方案，分析了它的安全性和效率，构造了一个对它的联合攻击，并且对原方案进行改进，并提出一个改进方案。(2)电子商务代替传统商务作为人类社会发展的又一大进步正在迅猛发展，电子现金作为不可缺少的支付方式正逐步被接收和使用。本文对电子现金的研究和使用做了概括和分析，简要介绍了一些主要的有意义的方案和目前使用的系统，提出了几个要解决的问题，展望了电子现金的未来。在公平的盲群签名方案的基础上，设计了一个多银行电子现金系统，该系统是离线的，公平的，能有效的防止重复消费，具有现金追踪功能和现金所有者追踪功能，能有效防止敲诈等犯罪行为。比LR98盲群签名方案构造的电子现金系统具有更高的安全性，在效率上，与LR98盲群签名方案构造的电子现金系统相同。更多还原

【Abstract】 With the development of Internet,electronic commerce has attracted more and more attentions as a new commerce mode. Electronic payment systems are significant for electronic commerce. Electronic cash is a very important electronic payment system. In this thesis,we pay our more attention to how to use some modern cryptographic technologies, such as Group Digital Signature, Blind Digital Signature, Group Blind Digital Signature to construct a new electronic cash system. The whole thesis was composed of two parts: First, study on cryptographic constructs called Group Digital Signature, Blind Digital Signature ,Group Blind Digital Signature; Second, study on electronic cash system.(1) Recently, group signatures, Blind Signatures and their combination result called group Blind Signatures which have been widely used in political area, military area and commerce area have been becoming the hot topics of modem cryptographic technology. For example, they have already been used in electronic election,electromc voting and electronic cash. This thesis first introduced the famous Blind Group Digital Signarure-LR98 , and then annoysis the securety and the efficiency of this signature, proved that this original scheme was not safe enough to resist a coalition-attack , in the end, provided a modified scheme of the original scheme to avoid the attack.(2) Electronic payment systems are essential tools for E-commence. Electronic cash will play an important role in the future due to its unique anonymity property: About 20 years works in the literature of electronic cash are analyzed. Some open problems that should be studied are presented. The future of electronic cash system will be predicted. Based on the fair Blind Group Digital Signature, a new multi-bank electronic cash system is proposed. This new electronic cash is off-line and fair, it also supports coin tracking and owner tracking. The new electionic cash system is more securative than LR98 E-cash,and have the same efficiency as LR98 E-cash.更多还原