安全局域网环境下安全邮件系统的设计与实现

本文提出了一种在安全局域网中部署安全电子邮件系统的设计与实现方案。该方案对邮件用户和邮件本身进行分级管理，以实现多级安全控制；并在邮件服务器和邮件客户端之间加入邮件代理服务器，设计邮件客户端与邮件代理服务器之间的通信协议，以实现对系统用户集中、动态的监控。系统实践的结果表明：在安全局域网环境下，该系统在保证电子邮件服务的同时，较好地解决了窃听、截取、重写和邮件泄密等邮件安全问题。

The Design and Implementation of a Secure Email System in the Secure LAN environment

A design and implementation scheme was devised for deploying a secure E-mail system in the secure LAN.The scheme a- chieved multi-level security control by grading management of mail users and mails themselves.Also,the scheme achieved central- ized and dynamic monitoring of system users by adding mail proxy between mail server and mail clients with designing communication protocols between clients and proxy.System implementation tests show that this scheme has solved wire tapping,intercepting,rewri- ting,divulging and other mail secure problems with guaranteeing E-mail service simultaneously in the secure LAN environment.