A credential can be anything from simple password to a complex cryptographic key.

凭证可以是从简单的密码到复杂的加密密钥的任何东西。

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A ticket is provided by an authentication server to the client using a cryptographic key of the intended server.

身份验证服务器使用目标服务器的一个密码密钥将票据提供给客户端。

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Finally, there is strong authentication in which an identity is verified using two or more methods, such as a password and a cryptographic key.

最后是强身份验证，其中使用两种或者更多的方法对一个标识进行验证，如密码和加密密钥。

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The technique exploits the arcana of quantum mechanics to let two computers swap a cryptographic key (and thus the means to decode a message) with perfect security.

ECONOMIST: Optical communications

The secure element doesn't necessarily need to have power running through it or to be in the midst of near-field communication in order to yield up its cryptographic key to a clever intruder who has sufficient time and sufficient desire to breach the security of a smartphone, bank card or national border.

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