Two-factor authentication is a user authentication system where an user needs to provide two different factors to authorize the user's identity. It is not a new concept and in many places we are knowingly or unknowingly using it for secure access. There could be multiple factors too and that known as Multi-factor authentication. Today in this post we will learn basics about this type of authentication system. As I mentioned above, two-factor and multi-factor authentications are not new. We are commonly using it in multiple places where we have strong security concerns. For example, your debit card or credit card. That also uses a two-factor authentication system. You can take example of your banking transactions too. Here you might ask me how these are related to such two-factor authentication. Ok, lets take the example of debit/ATM card that you use in ATM machines. You present the card which has a magnetic stripe which poses your card...


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