In the scheme, two-way authentication may be done between two users without exposing their secret information.

该方案中，用户在证实自己身份的同时不必泄漏自己的秘密信息。

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However, while SSH still provides two-factor authentication, when used this way it is not sufficient to identify the individuals who are accessing the cloud instances.

在以这种方式使用时，尽管SSH仍然提供二元身份验证，但是SSH密钥不足以识别访问云实例的用户的身份。

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One way of doing this is to use image-authentication systems to reveal if someone has tampered with a picture.

一种做法是运用图像鉴定系统来显示是否有人擅自改动了图片。

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If we were building the Net from the ground up knowing what we know today, authentication might have figured into the core in a way absent today.

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On Facebook, for example, two-factor authentication is triggered when users try to log in in an unexpected way, such as from a computer in a different country.

BBC: Technology

Authentication has been embraced by many players in the TV industry as a way to head off the possibility that consumers could begin dropping their cable and satellite TV subscriptions in favor of lower-cost online video services, such as Netflix Inc.

WSJ: ESPN Launches App for Mobile-TV Devices