Secure Tunnel Connection & Release 安全隧道的建立与释放
Because the secure connection must "tunnel" through the proxy server to the intended destination, malicious proxy servers can very easily eavesdrop on any conversation.
因为安全连接必须由代理服务器提供一个隧道才能到达目的地，因此恶意的代理服务器就可以很容易地窃取任何会话。
A private network between two remote sites, over a secure encrypted virtual Internet connection (a tunnel).
两个远程站点间专用网络，通过安全加密的虚拟因特网连接通道。
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