Understanding MFA
Multi-factor authentication (MFA) adds layers of security beyond a simple password by requiring users to verify their identity through multiple independent factors. Even if an attacker compromises one factor (such as a stolen password), they cannot gain access without the additional factors. MFA reduces the risk of unauthorized access by over 99% compared to password-only authentication.
MFA is required by virtually every security compliance framework and is considered one of the highest-impact, lowest-cost security controls an organization can implement. It is particularly critical for privileged accounts, remote access, email systems, and any system that handles sensitive data.
Not all MFA methods are equal. SMS-based verification is better than passwords alone but is vulnerable to SIM swapping and interception. Hardware security keys and authenticator apps provide significantly stronger protection against phishing and account takeover attacks.
Authentication Factors
Something you know
Password, PIN, security questions. The most common but weakest factor when used alone.
Something you have
Hardware security key (FIDO2/WebAuthn), authenticator app (TOTP), smart card, mobile device.
Something you are
Fingerprint, facial recognition, voice recognition, retinal scan. Biometric factors.
Somewhere you are
Geographic location, IP address, network. Often used as a supplementary signal rather than primary factor.