Two-factor authentication (2FA)
from whatis.com Two-factor authentication (2FA) is a security process in which the user provides two authentication factors to verify they are who they say they are. 2FA can be contrasted with single-factor authentication (SFA), a security process in which the user provides only one factor -- typically a password.
Two-factor authentication products can be divided into two parts: tokens that are given to users to use when logging in, and infrastructure or software that recognizes and authenticates access for users who are using their tokens correctly. The authentication tokens may be physical devices, such as key fobs or smart cards, or they may exist in software as mobile or desktop apps that generate PIN codes for authentication.
Two-factor authentication has long been used to control access to sensitive systems and data, and online services are increasingly introducing 2FA to prevent their users' data from being accessed by hackers who have stolen a password database or used phishing campaigns to obtain users' passwords. The additional layer of security makes it harder for attackers to gain access to a person's devices and online accounts, because knowing the victim's password alone is not enough to pass the authentication check.
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