基于对称加密体制和散列链的新型公正微支付系统  

A New Fair Micropayment System based on Symmetry Encryption Scheme and Hash Chain

作　　者：郎为民[1] 焦巧[2] 李建军[1] 刘建中[1] 

机构地区：[1]解放军通信指挥学院,湖北武汉430010 [2]武汉职业技术学院,湖北武汉430073

出　　处：《信息网络安全》2009年第3期4-6,31,共4页Netinfo Security

基　　金：国家自然科学基金资助项目(60602029)

摘　　要：现有的微支付系统通常不提供公平性,即参与微支付交易的消费者和商家有可能通过交易中的欺诈行为来获取商业利益。本文利用密码学中散列函数的单向特性,提出了一种基于对称加密体制和散列链的新型公正微支付系统,它属于离线预支付系统,支持数字货币的可分性,并允许消费者使用同一个散列链与多个商家进行交易。在支付过程中,一个循环交互协议使得消费者和商家的利益都得到了保障,从而大大提高了系统的公平性。与其它微支付方案(如PayWord)相比,由于本系统完全没有使用公开密钥算法,因而效率大大提高。此外,系统还为消费者提供了有限的匿名性。Micropayment systems in existence usually do not provide fairness, which means that either the customer or the merchant, or both, can cheat each other and gain a financial advantage by misbehaving in the protocols. Considering the main characteristics of one-way Hash function in cryptology, this paper proposes a new fair micropayment system based on symmetry encryption scheme and hash chain, which is an off-line, prepaid system and supports divisibility of digital coins in a simpler way. Moreover, in our system, a hash chain can be used to have transactions with different merchants and an iterative payment protocol is performed which protects the profits of both consumers and merchants to improve the faimess of our system. Compared with other micropayment schemes, e.g. PayWord, no public-key operation is required, which improves the efficiency of our system. In addition, restricted anonymity is provided in our system.

关 键 词：微支付 散列链 PAYWORD 可分性 

分 类 号：TP309.2[自动化与计算机技术—计算机系统结构]