Have you wondered why an otp is required to make a transaction or additional pin code to access your social media
Well if you must know they are called Multi-factor authentication, simply put an “Extra security check”.
Two-factor authentication (2FA) is a type of Multi-factor authentication. 2FA is an extra layer of security used to make sure that people trying to gain access to an online account are who they say they are. First, a user will enter their username and a password. Then, instead of immediately gaining access, they will be required to provide another piece of information. One good example of the two-factor authentication is the one-time password (OTP) or a code generated or received by an authenticator (e.g Security Token or Smart Phone) that only the user possesses.
Key Factors in authentication –
Something to have: physical objects you have in your possession e.g Bank Card, Key
Something you know : a secret knowledge you have like a password, a PIN, etc.
Something you are – physical characteristics of the user (biometrics), e.g. fingerprint, eye iris, voice, typing speed, etc.
Somewhere you are – some connection to a specific computing network or utilizing a GPS signal to identify the location.