论文标题:代理签名与多银行电子现金系统研究
Study on Proxy Signature and Multi-Bank E-Cash System
论文作者
论文导师 王彩芬,论文学位 硕士,论文专业 计算机软件与理论
论文单位 西北师范大学,点击次数 86,论文页数 54页File Size3106K
2007-05-01论文网 http://www.lw23.com/lunwen_568683882/
Proxy Signature;; Anonymous Proxy;; Self-Certified;; Multi-Bank E-Cash System
传统商务被电子商务所取代已经成为商业发展新趋势,它们的重要区别之一就是支付的电子化。电子现金是电子支付最有吸引力的方式之一,电子现金系统的研究受到了国内外很多学者的关注。为了更符合现实需求,有学者提出了“多银行”电子现金系统的概念。多年来,相关方案相继提出,这些方案多数是基于群签名的,它们虽有各自的优势,但也不同程度的存在不足。 代理签名是一种新型的数字签名,它允许原始签名人将签名的权力委托给代理签名人,让代理人代表原始签名人进行有效的数字签名。这种委托思想恰恰满足了多银行系统模型的需求,因此有学者提出了基于代理的多银行电子现金系统,并给出了一个实现方案。此方案在多银行管理和计算效率上有明显的优势,但是也存在着安全隐患,降低了它的实用性。 本文首先介绍了密码学中常用的三个数学困难问题和数字签名的相关知识,总结回顾了代理签名的发展和研究现状,讨论了代理签名的定义和分类,描述了M-U-O代理签名方案和一个匿名代理签名方案。然后,结合自证明公钥体制和匿名代理签名,设计出一种自证明匿名代理签名方案,此方案不仅能减轻验证者的负担,还具有匿名性和可跟踪性的特点。接着,本文又介绍了电子商务和电子支付的相关概念和知识,概括了多银行电子现金系统的研究进展,指出了现有方案的不足。最后,基于我们提出的自证明匿名代理签名,设计出一个多银行电子现金系统方案。该方案不需要完全可信的第三方,系统模型更加简单;增强了发币银行的不可否认性和匿名性,从而增强了整个系统的安全性和电子现金的匿名性;同时,自证明公钥体制的应用也减轻了商家及其存款银行验证电子现金的负担。总之,该方案具有较强的实用性,改进了现有的基于代理的多银行电子现金系统。
Substituting Electronic Commerce (E-commerce) for traditional business has become a new trend in commercial development. One of the most important differences between them is electronic payment. As electronic cash (E-cash) is one of the most attractive electronic payment forms, electronic cash system has attracted lots of researchers" attention at home and aboard. In order to satisfy practical requirement, multi-bank E-Cash system has been proposed. In recent years, many related strategies based on group signature have also been provided. Generally, each of them has certain degree flaws although they have some advantages respectively. Proxy signature, which allows the original signer to entrust the signature rights to proxy signer and enables the proxy signer to sign effectively on behalf of him, is a new kind of digital signature. Since the idea of proxy signature just meets the requirements of multi-bank system models, some researchers come up with multi-bank E-cash system based on proxy signature and provide an implement scheme which has remarkable advantage in multi-bank management and computing efficiency. However, there are some hidden dangers in the scheme and thus limit greatly its practical utility. The present paper firstly introduces 3 mathematics-dilemmas commonly used in cryptography and some basic knowledge related to digital signature. It also discusses the development and research current situation as well as the definition, classification and several classic schemes of proxy signature. Then, a self-certified anonymous proxy signature scheme based on the view of self-certified public key policy and the scheme of anonymous proxy signature are proposed. The proposed scheme not only lightens the burden of verifier, but also has characteristics such as anonymousness and trackability. After that, related knowledge and concepts about E-Commerce and electronic payment have been introduced. The development of studies on multi-bank E-Cash system is reflected, and the shortcomings of system schemes are also analyzed. At last, a scheme of multi-bank E-Cash system based on the self-certified anonymous proxy signature proposed above has been designed. A completely trusted third party is not necessary in our scheme. It makes the system model simpler and reinforces undeniability and anonymousness of cash-publishing bank, therefore strengthens security of whole system and anonymousness of E-Cash. The application of self-certified public key policy also can lighten the burden of verifying cash for corporation and depositing bank. In conclusion, the scheme has powerful utility to improve current multi-bank E-cash system based on proxy signature.
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