一种基于ECC的可恢复离线电子支付系统  

A Recoverable Off-line Electronic Payment System Based on ECC

作　　者：郎为民[1] 杨宗凯[1] 吴世忠[2] 谭运猛[1] 

机构地区：[1]华中科技大学电子与信息工程系,武汉430074 [2]中国国家信息安全测评认证中心,北京100091

出　　处：《计算机科学》2004年第10期74-75,83,共3页Computer Science

基　　金：国家自然科学基金(90104033)

摘　　要：本文提出了一种高效的基于椭圆曲线密码体制(ECC)的可恢复电子支付系统,与传统的基于RSA及离散对数问题的电子支付系统相比,我们提出的系统所需安全参数字节较短且易于扩展,因而存储、计算和通信效率大大提高,同时也满足了所有的安全要求。此外,用户可以借助可信第三方(简称TTP)恢复因计算机崩溃或电子钱包遗失等原因而丢失的电子现金,并能有效防止重复花费、欺诈行为和高手段犯罪。This paper proposes an efficient recoverable electronic cash system. Compared with previous RSA based E-cash and Discrete Logarithm based E-cash systems, ECC possess fewer bits achieving the same security level as other public key cryptosystems, so our system requires much shorter security parameter size and it also scales better. That is to say, our new system improves the storage, computation and communication efficiency while keeping all the security features at the same time. With the help of Trusted Third Party(TTP), each consumer can recover the lost money even if the computer has crashed and all the files are removed accidentally, or his e-cash wallet has been lost. Furthermore, our system can prevent from double spending, fraud and perfect crime effectively.

关 键 词：可信第三方 椭圆曲线密码体制(ECC) 重复花费 恢复 通信效率 离散对数问题 字节 电子支付系统 电子钱包 电子现金 

分 类 号：TP393[自动化与计算机技术—计算机应用技术] TP309[自动化与计算机技术—计算机科学与技术]