基于广义签密方案的多功能电子邮件协议研究

Research of Multi-functional E-mail Protocol Based on the Generalized Signcryption Scheme

广义签密具有签密、签名和加密多功能的优势,适用于设计安全的电子邮件协议.为解决电子邮件协议中的安全问题,提出了一个新的无需可信任PKG的广义签密方案,并在此基础上设计一种能够发送私人邮件、公告邮件的多功能电子邮件协议.该协议利用密钥追溯技术解决私钥托管问题,利用身份认证技术有效地阻止垃圾邮件的接收,通过随机预言模型证明方案的安全性.分析表明,提出的协议有效地增强了邮件传输过程中信息的安全性,多功能特性提高了传统电子邮件协议的信息处理能力,方案的效率也有所提高.

Generalized signcryption can provides signcryption, signature and encryption, which is suitable to design safe e-mail proto- col. In order to solve the security problem of e-mail protocol, a new reducing trust PKG generalized signcryption scheme is presen- ted, and then we design a multi-functional e-mail protocol with sending private e-mail and bulletin e-mail based on the generalized signcryption scheme. The protocol can solve the key escrowing problem using key retrospection, solve the garbage e-mail problem u- sing identity authentication, and we prove the security of the scheme using random oracle model. Analysis shows that the protocol en- hances the security of transmitting message, multi-functional can improve the information process ability of traditional e-mail proto- col, and the scheme is more efficiency.