GLOSSARY / Multi-Factor Authentication (MFA)

What is Multi-Factor Authentication (MFA)?

Requiring two or more independent proofs of identity to authenticate.

MFA combines something you know (password), have (token/phone), or are (biometric). It dramatically reduces account-takeover risk even when passwords are stolen.

Phishing-resistant MFA (FIDO2/passkeys) defeats real-time phishing proxies that bypass OTP-based MFA.

Related free tools

HIBP Check → Password Strength →

Related terms

Brute-Force Attack Credential Stuffing

Part of the Ciphers Security glossary. Free reference for analysts, defenders & learners.