【摘要】 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.更多还原

【Abstract】 Generalized signcryption can provides signcryption,signature and encryption,which is suitable to design safe e-mail protocol. In order to solve the security problem of e-mail protocol,a new reducing trust PKG generalized signcryption scheme is presented,and then w e design a multi-functional e-mail protocol w ith sending private e-mail and bulletin e-mail based on the generalized signcryption scheme. The protocol can solve the key escrow ing problem using key retrospection,solve the garbage e-mail problem using identity authentication,and w e prove the security of the scheme using random oracle model. Analysis show s that the protocol enhances the security of transmitting message,multi-functional can improve the information process ability of traditional e-mail protocol,and the scheme is more efficiency.更多还原