摘要
分析了电子邮件中广泛使用的PGP系统，SMPT、POP3协议及PEM标准中的安全问题。PGP存在信任度递减、假冒攻击问题，SMTP、POP3没有采取安全措施，PEM建立了基于证书中心的安全机制。
The security problems of Electronic Mail Systems widely used nowadays is researched into, SMTP and POP3 protocols and PEM standard is analyzed. PGP is the existing of pseudonym attacking, credit abasing. SMTP, POP3 don't take any security mechanism, and PEM set up security proposal based on certification authority.
出处
《计算机工程与设计》
CSCD
北大核心
2000年第5期1-5,共5页
Computer Engineering and Design
