摘要： 围绕 ＰＫＩ，分析了几种使用 ＰＫＩ的 Ｅｍａｉｌ系统，包括： ＰＧＰ（Ｐｒｅｔｔｙ Ｇｏｏｄ Ｐｒｉｖａｃｙ）、 ＰＥＭ（Ｐｒｉｖａｃｙ Ｅｎｈａｎｃｅｄ Ｍａｉｌ）和利用安全性扩展的 ＤＮＳ的Ｅｍａｉｌ传输。这些运用都有自己的优缺点，但是通过分析比较有利于令后产生更加适用、安全的ＰＫＩ系统。

关键词: Email, PKI, 证书机构, 证书, PGP, PEM, DNS

Abstract: This paper discusses some PKIs, such as PGP, PEM and domain name system security extensions, highlighting its general strengths and weaknesses. These PKIs are simple and have gained widespread acceptance, but they are unsuitable for most applications beyond casual conununicahon. The discussion may help to inspire people to "start over from scratch" in the hopes of creating a simpler system.

中图分类号: 

• TP393