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通常,一封电子邮件的内容在能够接收它的任何一台机器上都可以看到。不过,事实并非一定如此。在电子邮件和数据加密领域,PGP(Pretty Good Privacy)是最为有名的加
Often, the content of an e-mail can be seen on any machine that can receive it. However, this is not necessarily the case. PGP (Pretty Good Privacy) is the most famous add-on in email and data encryption