Cryptographic authentication USES mathematics and a digital secret in order to authenticate users.

密码认证使用数学和数字秘密来认证用户。

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To use the Google Buzz PHP Client Library, you will also need to register your web application with Google and obtain the necessary OAuth consumer secret for OAuth authentication.

要使用 Google Buzz PHP Client Library，您也需要将您的 web 应用程序注册到 Google 并获得进行 OAuth 身份认证所必需的 OAuth 消费方机密（consumer secret）。

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The client decrypts the message from the authentication service using client secret key.

客户端使用它的秘密密钥解密来自身份验证服务的消息。

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He also advised adopting two-step authentication, which involves a personalised "secret number" allocated to users in addition to a username and password, and ensuring that the latest version of Wordpress is installed.

BBC: Wordpress website targeted by hackers