Abstract: A certified E-mail protocol is about fair exchange of a message m for its receipt. Fairness is the most important property in exchange. It modifies existing convertible authenticated encryption scheme so that it can be used by certified E-mail protocols, and based on the scheme, a new certified E-mail protocol is proposed to guarantee privacy and low computation overhead.

Key words: electronic commerce, fair exchange protocols, certified E-mail protocols, convertible authenticated encryption scheme

摘要： 认证邮件协议是指邮件发送方将邮件m与接收方收到该邮件的证据进行交换的协议。认证邮件协议要满足的最重要的性质就是公平性。对原有的一种可转换的认证加密方案进行了改进并且在改进方案的基础上设计了新的认证邮件协议，新的协议执行效率高且弥补了其他认证邮件协议中无法保证邮件机密性的缺陷。

关键词: 电子商务, 公平交换协议, 认证邮件协议, 可转换的认证加密方案

CLC Number: 

• TP309