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research on spam,
where did these people get my address? theres tones of chances where you could of left youre emaill on the web, like websites, chat rooms... spammers have special programs to detect email addresses like searching for the @ sign. these programs are called spambots. one of their common target would be the email servers of large hosting companies, where they can do a dictionary search from msn ,aol, or hotmail. 【程序编程相关:make up】
what is a spam? all i can say is that its junk mail which you dont want to see hanging around in your mail box. 【推荐阅读:sleep】
3850 总结 【扩展信息:中国客运列车旅客乘车情况问卷（A卷）】
four major email encryption protocols : moss, pgp, pgp/mime, and s/mime.
1 smine which refers to 发送与接收安全的mime. 使用公匙前必须用x.509 public key infrastructure (pkix) certificates 来确认它的真伪,smine agents 同时必须按照pkix 与 keyn 所描述的process 过程来完成certificate 的process.这种特性是与 cryptographic message syntax cms 兼容的,并遗传了其中所有基於key管理的支持.
ac介绍,在一个 x.509公匙证书中可以含有两个509ac(even with same subject name and public key, 但要调整好之间overlap的合理性),每个 509ac 还可以邦定多个attributes.
definition of a certificate: binding an entity name with public key using a digital signature.
2 接受方验证签名时应display certificate information such as subject name and details. 并拒绝所有没有有digital signature or nonrepudiation bit set.
7 验证失败的几种可能:
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