Defense in Depth vs Two-Factor Authentication (2FA)

Defense in depth is a security strategy implementing multiple independent layers of protection so that if one measure fails, additional safeguards prevent attacks.

Security method requiring two different forms of verification to access an account—typically something you know (password) and something you have (phone, authenticator app, or hardware key)—providing critical protection against unauthorized access even if passwords are compromised. Also known as: 2FA.