This secret key is known only to the user and the security server.

此秘密密钥只有该用户和安全服务器知道。

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Requesters can authenticate recipients using network and transport-provided security, claims proven in messages, and encryption of the request using a key known to the recipient.

通过网络和由传输提供的安全性、消息中已批准的声明，以及用收件人已知的密钥对请求进行加密，请求者可以对收件人进行身份验证。

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Less commonly known is that the pig later improved his home's safety profile by installing convex security mirrors at key points along the driveway.

但是大部分人都不知道，之后这只小猪又在车道重点部位安装了凸面镜来加强房屋的安全防护。

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"Food sovereignty" - a term adopted instead of the better-known notion of "food security" - was hailed by many as a key step for developing nations to become more resilient to emerging food crises.

BBC: Alternative views of the economic crisis