Sentrly
2FA Methods Compared
SMS, email, TOTP, push and hardware keys — security, convenience and recovery.
For best security, use a hardware key (FIDO2/WebAuthn) where supported, with TOTP as a fallback. Avoid SMS for high-value accounts because of SIM-swap risk.
Any 2FA is better than no 2FA, but the methods differ wildly in how phishable, interceptable and recoverable they are. The further down the table, the stronger the method.
| SMS code | Email code | TOTP app | Push approval | Hardware key (FIDO2) | |
|---|---|---|---|---|---|
| Phishing-resistant | No | No | No | Partial | Yes |
| Resistant to SIM-swap | No | Yes | Yes | Yes | Yes |
| Works offline | No (needs cell) | No | Yes | Partial (cached) | Yes |
| Setup difficulty | None | None | Low (scan QR) | Low | Moderate (buy + register) |
| Recovery if device lost | Reissue SIM | Email recovery | Backup codes / sync | Backup codes / second device | Spare key (you should own two) |
| Cost | Free | Free | Free | Free | $25–$80 per key |
| Best for | Last-resort fallback | Low-value accounts | Most personal accounts | Convenience on managed mobile | Email, password manager, identity provider, dev tooling |
Frequently asked questions
Should I always buy two hardware keys?
Yes. One stays with you; one stays in a safe. Replacing a single lost key without a backup is a slow and painful process.
Is push 2FA safe?
It's safer than SMS but vulnerable to MFA-fatigue prompts. Use number-matching where the service supports it.
Can I mix methods?
Yes — and you should. Hardware key as primary, TOTP as backup, recovery codes printed out.
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