Two-Factor Authentication (2FA)

Definition

Two-factor authentication requires two different authentication factors—typically something you know (password) and something you have (phone/hardware key). 2FA protects exchange accounts and wallet applications, adding defense beyond the password alone.

Technical Explanation

2FA methods: TOTP (time-based codes from apps like Authy), SMS (less secure—SIM swap vulnerable), hardware keys (FIDO2/WebAuthn), and push notifications. Hardware keys provide strongest protection, especially phishing-resistant WebAuthn.

Quantum considerations: TOTP uses HMAC-SHA1—hash-based, quantum-resistant. Hardware keys use ECDSA—quantum-vulnerable long-term. FIDO2 with post-quantum signatures is emerging. Defense-in-depth: 2FA protects accounts, not private keys directly.

SynX Relevance

Enable 2FA on exchanges holding SynX and any web-based wallet services. Use hardware keys or TOTP apps—avoid SMS. Your SynX private keys have separate quantum-resistant protection; 2FA adds account-level security.

Frequently Asked Questions

Is 2FA quantum-resistant?: TOTP (app-based) uses hash functions—quantum-resistant. Hardware keys need post-quantum updates.
Which 2FA method is best?: Hardware keys (YubiKey, etc.) > TOTP apps > SMS. Avoid SMS for high-value accounts.
Does 2FA protect my wallet?: 2FA protects account access. Your private keys have separate protection (encryption, quantum-resistant signatures).

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