Two-Factor Authentication: The Guide

By Thomas & Øyvind · Published June 1, 2026

If a password manager is the highest-value security habit, two-factor authentication is a very close second — and together they stop the overwhelming majority of account takeovers. 2FA means logging in requires something you know (your password) plus something you have (a code or key), so a stolen password alone is not enough. Understanding the methods, which vary a lot in strength, lets you protect what matters most.

Ranked roughly from strongest to weakest: hardware security keys (a physical device, extremely phishing-resistant) are the gold standard for critical accounts; authenticator apps that generate rotating codes are strong and convenient for everyday use; and SMS codes are better than nothing but the weakest, vulnerable to SIM-swapping, so avoid SMS for important accounts where a better option exists. Password managers such as NordPass and privacy ecosystems like Proton increasingly integrate 2FA handling, keeping it convenient enough that you actually use it.

The practical priority: enable 2FA first on the accounts that unlock everything else — your primary email and your password manager — then your financial and important accounts. Email is the master key; protecting it well protects most password resets.

This is the natural partner to our password managers guide and underpins everything from identity theft protection to general online privacy. No VPN or antivirus matters much if an attacker can simply log into your accounts.

Turn on 2FA, prefer apps or hardware keys over SMS, and protect your email first. General guidance.