![]() Multi-factor authentication ( MFA encompassing two-factor authentication, or 2FA, along with similar terms) is an electronic authentication method in which a user is granted access to a website or application only after successfully presenting two or more pieces of evidence (or factors) to an authentication mechanism: knowledge (something only the user knows), possession (something only the user has), and inherence (something only the user is). Security information and event management (SIEM). ![]() Host-based intrusion detection system (HIDS).
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