Multi-Factor Authentication Implementation — Beyond SMS Codes
Implementing TOTP, authenticator apps, push notifications, and understanding why SMS MFA is the weakest option
You know the drill. You enter your password, and then the site asks for a code from your phone. That second step is multi-factor authentication (MFA) — proving your identity with something beyond just a password. It's one of the most effective security measures you can implement, and it's also one of the most poorly understood.
MFA works because it requires factors from different categories. Even if an attacker steals your password, they still can't log in without your phone, your fingerprint, or your security key. But not all MFA methods are equally secure. The difference between SMS codes and hardware security keys is enormous, and understanding these differences helps you build the right MFA experience for your users.
The Three Factors
Authentication factors fall into three
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