并且，正如我们可以从本系列的第2部分有关数字证书的讨论中看到的一样，服务器还必须要在握手过程中提供安全证书。

And, as you might recall from the digital certificates discussion in Part 2 of this series, the server must also provide the security certificate used during the handshake.

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有时我们必须要通过一个安全通道来提供这些服务。

At times it is necessary to provide these services across a secure channel.

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大家的安全是我们的责任。但是要保证安全，我们必须要遵守一些简单的规则。

Your safety is our responsibility. But to keep safe we must follow some simple rules.

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