Multi-Factor Authentication Explained

Protect accounts beyond passwords — requiring multiple independent verification factors to prevent unauthorized access.

Multi-Factor Authentication

Multi-Factor Authentication (MFA) is a security mechanism that requires users to verify their identity using two or more independent factors: something they know, something they have, or something they are.

Explanation

MFA adds security layers beyond passwords. The three factor categories are: knowledge (passwords, PINs, security questions), possession (phone with authenticator app, hardware security key, SMS code), and inherence (fingerprint, face recognition, voice). Requiring two or more factors means a compromised password alone is insufficient for unauthorized access. TOTP apps (Google Authenticator, Authy) generate time-based codes. Hardware keys (YubiKey, Titan) provide phishing-resistant authentication. SMS codes are widely used but vulnerable to SIM-swapping attacks. Passwordless authentication (passkeys, WebAuthn) represents the evolution beyond traditional MFA.

Bookuvai Implementation

Bookuvai implements MFA for all applications handling sensitive data. We integrate TOTP-based authentication, support hardware security keys via WebAuthn, and implement adaptive MFA that triggers additional verification for high-risk actions like payment changes or role modifications.

Key Facts

  • Requires two or more independent verification factors
  • Three factor categories: knowledge, possession, and inherence
  • TOTP apps and hardware keys are more secure than SMS codes
  • Prevents 99.9% of automated attacks according to Microsoft research
  • Passkeys and WebAuthn represent the future of passwordless MFA

Related Terms

Frequently Asked Questions

Is SMS-based MFA secure?
SMS MFA is better than no MFA but vulnerable to SIM-swapping and interception attacks. Use TOTP apps (Google Authenticator, Authy) or hardware keys (YubiKey) for stronger security. Reserve SMS as a fallback option only.
What are passkeys?
Passkeys use public-key cryptography stored on your device (phone, laptop) for passwordless authentication. They are phishing-resistant, device-bound, and simpler than traditional passwords plus MFA. Apple, Google, and Microsoft support passkeys via the WebAuthn standard.
Should I require MFA for all users or just admins?
Require MFA for all users when handling sensitive data (financial, health, PII). At minimum, require MFA for administrators and users with elevated permissions. Adaptive MFA can require additional factors only for high-risk actions.