Multi-Factor Authentication Implementation

Multi-Factor Authentication Implementation

Multi-factor authentication (MFA) significantly strengthens identity protection by requiring multiple forms of verification. Think of it as requiring both a key and a fingerprint to open a door—even if someone steals your key, they can't impersonate you without your fingerprint. However, poor MFA implementation can create a false sense of security while remaining vulnerable.

Common MFA implementation mistakes include using SMS for second factors despite known SIM swapping attacks, not properly verifying email-based codes, or allowing users to bypass MFA through "remember this device" features without proper device fingerprinting. Some applications implement MFA only for login but not for sensitive operations like password changes or money transfers. Others fail to consider account recovery flows, allowing attackers to bypass MFA entirely by claiming they lost their phone.