Two-Factor Authentication (2FA)
security · basics
An account security method requiring two different proof factors, such as a password plus an app code or hardware key.
- Also known as
- Two Factor Authentication, Multi-Factor Authentication
Two-factor authentication (2FA) adds a second check to a login or withdrawal flow. It combines something you know, have, or are so a stolen password alone is not enough.
Common methods include authenticator apps, hardware security keys, push prompts, email codes, and SMS. Hardware keys and authenticator apps are generally more phishing-resistant than SMS, which can be vulnerable to SIM-swap attacks.
2FA improves account security only if recovery is handled carefully. Backup codes, recovery emails, and device migrations should be stored securely, because attackers often target the weakest recovery path.
Related terms
Universal 2nd Factor (U2F)
→A hardware-backed second-factor standard that uses security keys for phishing-resistant account login.
security · authentication
Hardware wallet
→A physical signing device that keeps private keys isolated while approving cryptocurrency transactions.
wallet · security
Cryptocurrency Exchange
→A cryptocurrency exchange is a platform for buying, selling, or trading digital assets through crypto or fiat markets.
trading · exchange · platform