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What is Two-Factor Authentication (2FA)?

A security method requiring two different forms of identification before granting access to an account.

2FA combines something you know (password) with something you have (phone, hardware key) or something you are (biometrics). Even if a password is compromised, the second factor prevents unauthorized access.

Methods include TOTP apps (Google Authenticator, Authy), SMS codes (less secure due to SIM swapping), hardware keys (YubiKey), push notifications, and biometric factors. 2FA significantly reduces account compromise risk.

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Security Audit
A systematic examination of an information system to assess compliance with security policies, identify vulnerabilities, and verify controls.
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The process of verifying that user-supplied data meets expected formats, types, and ranges before processing it.
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A security technique that associates a host with its expected TLS certificate or public key, preventing man-in-the-middle attacks with fraudulent certificates.
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