biometrical data (this category is a little bit more advanced and might include biometrical finger print, scanning of diaphragm or voice print).confirmation of ownership (usually, it’s something that user owns, such as credit card, smart phone, or small hardware token).additional information (personal identification number (PIN), password, answers to “secret questions” or specific sequence of keystrokes).At first, the user enters his login and password, then, instead of immediately receiving an access, he must provide additional information, such as: 2FA is an additional level of protection that is used for confirmation of users that are trying to receive an access to online account.
Google Authenticator provides two-factor authentication (2FA).
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