Two factor authentication (also known as 2FA) is a type of authentication where it verifies something you have separately from the single factor authentication. In this kind of authentication, there will be a need where you are required to show what you have that the server understand prior getting verified. There are various 2FA solutions present in the market. Some the accepted ones are OTP Token, PKI USB Token and Smart Card as well. This hardware will give diverse piece of detail that is needed to do well with the authentication.

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