Two-Factor Authentication (2FA): Your First Shield Against Hacks
✦ Key takeaways
- 2FA requires a second factor in addition to your password.
- Authenticator apps are safer than SMS codes.
- Physical security keys are the strongest against phishing.
- Enable it first on your email — it's the key to your other accounts.
Passwords are stolen by the millions every day through site breaches and phishing. That's why a password alone no longer protects your account. The simplest, strongest fix is Two-Factor Authentication (2FA).
The idea, simply
Instead of one factor (something you know = your password), 2FA asks for a second: something you have (your phone, a key) or something you are (a fingerprint). Even if someone steals your password, they can't get in without that second factor. Google estimates that adding a second factor blocks over 99% of automated attacks.
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Types, weakest to strongest
| Type | Security | Note |
|---|---|---|
| SMS codes | Okay | Vulnerable to SIM swapping |
| Authenticator app | Strong | Generates a code every 30 seconds |
| Physical security key | Strongest | Phishing-resistant, e.g. YubiKey |
SMS is better than nothing, but an authenticator app is an excellent, free choice for most people. For sensitive accounts, a physical security key is the gold standard.
Start with the most important account: email
Your email is the master key: whoever gets in can reset the passwords of all your other accounts. So enable 2FA on your email first, then banks, social media and cloud storage.
Don't forget recovery codes
When you enable it, the site gives you "backup codes." Store them somewhere safe off your phone (paper, a password manager). If you lose your phone, these codes are your only way back in. Two minutes of setup today saves you a disaster tomorrow.