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What are the different types of credentials of a two-factor Authentication?

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Two-factor authentication calls for a second round of authentication to an account login process. Entering a username – password is a one-factor authentication. Username – Password authentication and then say mobile number or a secret key authentication can be considered as a two - factor authentication.

The different types of credentials for two-factor authentication can be:

Something you know - A PIN, password or a pattern

Something you have – ID, ATM No., Phone No, or an OTP

Something you are – Your Biometrics.