What is Multi-Factor Authentication?

What is Multi-Factor Authentication?

Multi-Factor Authentication (MFA) is a security mechanism that requires users to verify their identity using two or more independent factors before gaining access to a system or application. By combining multiple factors, MFA significantly reduces the risk of unauthorized access even if one factor (such as a password) is compromised.

Authentication factors

MFA combines factors from different categories:

• Something you know — passwords, PINs, security questions
• Something you have — mobile phones (SMS or authenticator apps), hardware tokens, smart cards
• Something you are — biometrics such as fingerprints, facial recognition, or iris scans

MFA in compliance frameworks

MFA is required or strongly recommended across all major frameworks:

• SOC 2 — CC6.1 requires multi-factor authentication for access to sensitive systems
• ISO 27001 — A.8.5 addresses secure authentication including multi-factor methods
• HIPAA — while not explicitly mandating MFA, the Security Rule requires access controls that effectively necessitate it for ePHI systems
• PCI DSS — Requirement 8.3 mandates MFA for all remote access to the cardholder data environment
• NIST CSF — PR.AC-7 recommends multi-factor authentication as part of identity management

Implementation best practices

• Require MFA for all user accounts, not just administrators
• Prefer authenticator apps or hardware tokens over SMS-based codes (which are vulnerable to SIM swapping)
• Implement MFA on VPN, cloud console, email, and any system containing sensitive data
• Provide backup recovery methods (recovery codes, backup devices) to prevent lockouts
• Monitor and alert on MFA bypass attempts or disabled MFA

How episki helps

episki tracks MFA policies, monitors enforcement across systems, and documents MFA evidence for compliance audits. Learn more on our compliance platform.