The ftp_ssl_connect function opens an secure SSL-FTP connection to a server.

函数的作用是：与服务器建立一个安全的SSL - FTP连接。

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No application data is transmitted until the secure SSL channel is established, a process during which the server machine is authenticated.

在安全的SSL通道建立(在此过程中对服务器计算机进行身份验证)之前，不会传输任何应用程序数据。

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If the application requires that the whole communication be secure, you'll use SSL.

如果应用程序要求整个通信是安全的，则您将使用SSL。

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These include such foundational patents of the web as Secure Socket Layer (SSL), cookies and JavaScript.

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Eight years ago, fresh out of Stanford, Kocher cowrote Secure Sockets Layer (SSL), the protocol that secures the vast majority of commerce on the Internet.

FORBES: Magazine Article

The report measures the rise of Secure Socket Layer (SSL) encryption within corporate Internet traffic, as well as other applications that complicate filtering by hopping between ports and other programs that are purposefully designed to evade monitoring.

FORBES: Encrypted Web Growth Poses Dilemma For Corporate Firewalls