google authenticator是否有电脑版

谷歌验证（Google Authenticator）通过两个验证步骤，在登录时为用户的谷歌帐号提供一层额外的安全保护。使用谷歌验证可以直接在用户的设备上生成动态密码，无需网络连接。特点：自动生成QR码；支持多帐户；支持通过time-based和counter-based生成。
　　当用户在Google帐号中启用“两步验证”功能后，就可以使用Google Authenticator来防止陌生人通过盗取的密码访问用户的帐户。通过两步验证流程登录时，用户需要同时使用密码和通过手机产生的动态密码来验证用户的身份。也就是说，即使可能的入侵者窃取或猜出了用户的密码，也会因不能使用用户的手机而无法登录帐户。
Typically, users will install the Authenticator app on their smartphone. To log into a site or service that uses two-factor authentication, they provide user name and password to the site and run the Authenticator app which produces an additional six-digit one-time password. The user provides this to the site, the site checks it for correctness and authenticates the user.
For this to work, a set-up operation has to be performed ahead of time: the site provides a shared secret key to the user over a secure channel, to be stored in the Authenticator app. This secret key will be used for all future logins to the site.
With this kind of two-factor authentication, mere knowledge of username and password is not sufficient to break into a user's account. The attacker also needs knowledge of the shared secret or physical access to the device running the Authenticator app. An alternative route of attack is a man-in-the-middle attack: if the computer used for the login process is compromised by a trojan, then username, password and one-time password can be captured by the trojan, which can then initiate its own login session to the site or monitor and modify the communication between user and site.