In 60 seconds
- Two-factor authentication requires another proof in addition to a password.
- Authenticator apps, security keys, or passkeys generally resist more attacks than SMS alone.
- Store recovery codes separately and keep at least one backup method current.
Not every second factor provides the same protection
SMS verification is widely available and is usually better than using only a password, but it can be exposed to number takeover and real-time phishing. Authenticator apps generate codes without relying on the mobile network, though a fake site can still ask a user to relay a code.
Security keys and passkeys can provide stronger phishing resistance because the credential is tied to the legitimate website. Availability varies by account and device, so use the strongest option the service reliably supports for you.
Recovery is part of the security setup
Losing the only enrolled phone can lock out the legitimate user. Add a second method where possible, print or securely store recovery codes away from the signed-in device, and review recovery email and phone details.
Never give a verification or recovery code to someone who contacted you. Support staff should not need a one-time code to prove that they are support.
Quick checklist
Enable a second factor on important accounts
Prefer a phishing-resistant option when available
Register a backup method
Keep recovery codes separate from the primary device
What is confirmed — and what needs caution
- Multi-factor authentication combines different types of evidence.
- Losing every recovery method can also block the legitimate account owner.
- Never send a one-time code to another person.
- Do not store the only recovery copy on the same device used for sign-in.
Primary sources
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