What is Two Factor Authentication?
Two Factor Authentication is a way to authenticate users using two of the three valid authentication factors: something the user knows (password, PIN, etc), something the user has (smart card, phone, ATM card, etc.), and something the user is (biometric data, including figerprints). In the case of this article, we will be using something the user knows, a password, and something the user has, a smartphone.
What is Google Authenticator?
Google Authenticator is a software based two-factor authentication token. It is available on iOS, Android, and BlackBerry operating systems. It provides a 6 digit, time or counter based number that acts as the 2nd factor for our two factor authentication.
Extracted From - http://www.codeproject.com/Articles/403355/Implementing-Two-Factor-Authentication-in-ASP-NET
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