Two-Factor Authentication (2FA)
Two-factor authentication (2FA) requires a second proof of identity, such as a code from an authenticator app or a security key, in addition to a password. It blocks most account takeovers that use stolen or guessed passwords, which makes it the single most effective security step for business accounts.
Key Facts
| Methods | Authenticator app codes, passkeys and security keys, SMS codes (weakest) |
|---|---|
| Protect first | Email, domain and DNS, cloud hosting, accounting, banking, admin panels |
| Recovery | Backup codes stored safely, and a second admin on critical accounts |
| For your own software | Build 2FA into admin and finance roles from the start |
Why it matters
Most business breaches start with a compromised email or admin account. With 2FA, a stolen password alone is not enough.
Rolling it out
- Turn it on for email, domain registrar, cloud and banking accounts.
- Require it for admin users in your own applications.
- Store recovery codes securely.
See cybersecurity basics for founder-led businesses.
Frequently Asked Questions
Is SMS-based 2FA good enough?
Better than nothing, but authenticator apps and passkeys are more resistant to SIM-swap and phishing attacks.
Will 2FA slow my team down?
Only slightly, and most apps remember trusted devices for a period.
Related Glossary
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