本文介绍的安全电子邮件系统通过信息安全技术对传统的电子邮件系统进行扩展和完善。
The SecureMail system introduced in this paper expands and completes the traditional E-Mail system with the information security technology.
论文同时分析了现有的电子邮件系统传输编码存在的缺陷，提出了一种利用编码效率高、数据扩展率低的数字数据变换方法：基数- 91编码来提高编码效率。
Meanwhile the paper analyzes the deficiency of current transmission coding and describes a new data transformation method, base91 coding with high encoding efficiency but low data extension.
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