WSS 规范提供通过对主体、标题、附件或其任意组合（或部分）进行加密和/或数字签名保护消息的方法。

The WSS specification provides a means to protect a message by encrypting and/or digitally signing a body, a header, an attachment, or any combination (or parts) of these.

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一旦FOE抓取到这些内容，它将其加密然后以附件的形式通过email发送出去。

Once FOE fetches the content, it encrypts it and sends it via e-mail much like an attached file.

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对于本文的目标来说，SSL可以认为是一个“附件”，它对底层IP协议进行加密、验证和认证。

For the purpose of this article, SSL can be regarded as an "add-on" that encrypts, validates, and authenticates an underlying IP protocol.

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