Two-factor authentication adds another layer of security protection to a user's account. Take your email account for example. What's normally required for you to log in are your username and password. That is called a single-factor authentication. A second-factor authentication or 2FA requires the user to provide two out of the types of verification.
Basic authentication with just one touch. A simple "Yes" or "No ."
Tried and tested private and public key pair for mutual and message authorization.
Out-of-band verification that serves as a shield against phishing and man-in-the-middle attack or MITM attacks.
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