Many others work with external systems, such as the open-source GPG, to encrypt e-mail.
许多人使用外部系统（比如开源的 GPG）来加密电子邮件。
Past systems designed to encrypt e-mails all relied on ways of storing their keys safely.
此前用作电邮加密的系统，全都仰仗安全存储密钥的招数。
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.
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。
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