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

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.