Two-Factor Authentication
An extra layer of account security requiring a second verification factor.
An extra layer of account security requiring a second verification factor.
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Sep 2026 · Freshness Score: 50%
Was ist Two-Factor Authentication?
An extra layer of account security requiring a second verification factor.
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- concept
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After entering a password, the user provides a second factor: an authenticator-app code (TOTP), SMS code, or hardware key (YubiKey, passkey). This prevents access with a stolen password alone. In crypto, 2FA secures exchange accounts and so
2FA is a basic but crucial defense for centralized accounts — exchange accounts without 2FA are prime targets. It complements self-custody best practices (hardware keys, passkeys). Understanding its limits (phishing, SIM swap) is essential
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1. What Is Two-Factor Authentication
Two-factor authentication (2FA) is a security process requiring two independent credentials — typically a password plus a one-time code or hardware key — to access an account or authorize an action.
2. How It Works
After entering a password, the user provides a second factor: an authenticator-app code (TOTP), SMS code, or hardware key (YubiKey, passkey). This prevents access with a stolen password alone. In crypto, 2FA secures exchange accounts and some wallets; hardware wallets themselves act as physical 2FA. Attackers increasingly use "2FA bypass" phishing (session theft, SIM swap).
3. Why It Matters
2FA is a basic but crucial defense for centralized accounts — exchange accounts without 2FA are prime targets. It complements self-custody best practices (hardware keys, passkeys). Understanding its limits (phishing, SIM swap) is essential for real security.
4. Key Facts
- TOTP authenticator apps are more secure than SMS
- Passkeys (WebAuthn) are phishing-resistant 2FA
- SIM-swap attacks bypass SMS 2FA
- Hardware keys offer the strongest 2FA
5. Related Concepts
- key-management
- crypto-wallet
- security
- passkey
Frequently Asked Questions
What is Two-Factor Authentication?
An extra layer of account security requiring a second verification factor.
How does Two-Factor Authentication work?
Two-factor authentication (2FA) is a security process requiring two independent credentials — typically a password plus a one-time code or hardware key — to access an account or authorize an action. After entering a password, the user provides a second factor: an authenticator-app code (TOTP), SMS
Why does Two-Factor Authentication matter in Web3?
- crypto-wallet - security - passkey