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文章介绍了电子邮件的基本原理、安全问题以及数据加密的基本理论，简要介绍了把ＤＥＳ与ＲＳＡ 算法相结合而研制的电子邮件加密系统（ＳＥＭ）。
This paper introduces the basic principles of e-mail, security and data encryption basic theory, a brief introduction to the DES and RSA algorithms developed by the combination of e-mail encryption system (SEM).