许多人使用外部系统（比如开源的 GPG）来加密电子邮件。
Many others work with external systems, such as the open-source GPG, to encrypt e-mail.
如果其中一个人想使她的电子邮件地址变得可用，她可以在她自己的FOAF文件中引用它，或许还可以象上面描述的那样对它进行加密。
If one of those people wishes to make her E-mail address available, she can reference it in her own FOAF files, and perhaps encrypt it as described above.
使用gpg加密的任何消息都可以使用GPG、PGP或支持任一程序的任何数量的电子邮件客户机插件来解密。
Any messages encrypted using GPG can be decrypted with GPG, PGP, or any number of E-mail client plug-ins that support either program.
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