基于智能卡的无证书离线电子现金方案

Certificateless offline e-cash scheme based on smart card

无证书密码体制避免了基于PKI密码体制的证书管理负担和基于身份密码体制的密钥托管问题。提出一种无证书的部分盲签名机制,并以此为基础,使用部分盲签名产生电子货币,利用智能卡防窜改技术防止电子货币的重复消费行为,设计了一种无证书的离线电子现金方案。新的部分盲签名机制是可证明安全的,仅需要三次对运算,计算性能较优。电子现金方案无须电子银行在线支持,在实现预付电子现金的同时能有效防止重复消费,并且计算开销和通信开销都低于其他无证书电子现金方案,可适用于移动电子支付场景。

The certificateless cryptography avoids the certificate management burden that exists in the PKI-based cryptography and the key escrow issue of identity-based cryptography.This paper proposed a certificateless partially blind signature scheme,and was used to generate the electronic money.It also proposed a certificateless offline electronic cash scheme,and adopted the tamper-proof smart card to prevent the double-spending of the electronic money.The new partially blind signature was provably secure,and it had better computing performance-only three times pairing calculation.The new e-cash scheme,without the online e-banking,realized the prepaid electronic cash,and could effectively prevent the double-spending of the electronic money.The computational costs and the communication overheads of the e-cash scheme are lower than the other certificateless ones.So,the new scheme can be used for the payment in the mobile scenarios.