1994年，网景公司（Netscape）意识到，如果要让电子商务在互联网上蓬勃发展，就必须解决一个根本问题：如何在不可信的网络上建立可信的通信。于是，安全套接层（Secure Sockets Layer, SSL）协议应运而生。 SSL 1.0从未公开发布，因为它存在严重的安全缺陷。

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