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Multi-factor authentication (MFA) is a security approach that strengthens identity verification by requiring two or more independent factors such as knowledge, possession, or inherence. MFA reduces the risk of credential compromise and aids regulatory compliance. Implementation requires integration with identity providers and balancing security, usability, a…
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Multi-factor authentication (MFA) requires at least two independent proofs from different factor types before granting access.
MFA grew from the requirement that one secret is insufficient account protection; NIST guidance organizes knowledge, possession, and inherence factors.
A door opens only with two different keys: a stolen password alone is insufficient.
Knowledge is something the person knows, such as a PIN.
Possession is something the person has, such as a security key.
Inherence is a bodily characteristic, such as a fingerprint.
MFA reduces risk from lost or stolen passwords; recovery, phishing resistance, and usability determine its practical security.
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