服务器不需要将保密密钥发送回客户端，因为客户端已经拥有了这个保密密钥。
There's no need for the server to send the secret key back to the client, because the client already has it available.
开发ssl就是为了解决这些保密性和服务器身份验证问题的，它现已得到了广泛使用。
SSL was developed to address these problems of confidentiality and server authentication, and is now widely used.
遗憾的是，这位科学家保密太严了。他既没留下任何文字资料，也没把飞行器的知识传授给别人，对谁也信不过。
The scientist, unfortunately, was very secretive: he hadn't kept any notes, and hadn't trusted anyone else with the knowledge of how his flying-machine worked.
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