摘要： 在电子现金方案中，需要使用证书证明公钥和密钥的托管，针对该问题提出一种无证书离线电子现金方案，运用双线性对构造电子现金中的无证书认证框架，解决用户密钥托管问题，提高电子现金中密钥的安全性。该方案减少身份认证步骤，提高交易速度和效率，构造一种简单有效的密钥交换方法。安全性和可行性分析结果表明该方案可靠。

关键词: 密钥交换, 双线性映射, 无证书签名, 电子现金

Abstract: Aiming at the problem that the public key and key trustee must be proved by certificate in electronic cash schemes, this paper proposes a certificateless off line electronic cash scheme. It uses the bilinear pairing to structure the frame of certificateless authentication in electronic cash, solves the problem of users’ key trustee and improves the security of electronic cash. This scheme reduces the processes of identity authentication and increases the rate and efficiency of the trade. It constructs a simple and effective key exchange method. Analysis results of security and feasibility show that the scheme is reliable.

Key words: key exchange, bilinear mapping, certificateless signature, electronic cash

中图分类号: 

• TP309