🔐2FA/TOTP Generator
Generate Time-based One-Time Password (TOTP) codes for two-factor authentication. Secure your accounts with 2FA codes.
🔐About 2FA/TOTP
TOTP (Time-based One-Time Password) generates time-sensitive codes for two-factor authentication.
How it works: Codes change every 30 seconds based on your secret key and current time.
Security: All processing happens locally. Your secret key never leaves your browser.
Note: This is a demonstration tool. For production use, use established authenticator apps.
🔗 Related Tools
🔐 How Two-Factor Authentication Works
⚡ TOTP Process
- Server generates a secret key
- Secret is shared with your device
- App generates time-based codes
- Codes change every 30 seconds
- Server validates the code
🛡️ Security Benefits
- ✅ Protection against password theft
- ✅ Prevents unauthorized access
- ✅ Works even if password is compromised
- ✅ Time-limited codes (30 seconds)
- ✅ No network required for code generation
📱 Popular 2FA Apps
🔐 Google Authenticator
Free, simple, and widely supported
iOS, Android
🔒 Authy
Cloud backup, multi-device sync
iOS, Android, Desktop
🛡️ Microsoft Authenticator
Passwordless sign-in support
iOS, Android
🔑 1Password
Built into password manager
iOS, Android, Desktop
⚠️ Security Best Practices
✅ Do's
- Keep your 2FA app updated
- Use backup codes when provided
- Enable 2FA on all important accounts
- Keep backup codes in a safe place
- Use different 2FA apps for different accounts
❌ Don'ts
- Don't share your secret keys
- Don't screenshot QR codes
- Don't use SMS 2FA if possible
- Don't store secrets in plain text
- Don't disable 2FA for convenience
🔬 Technical Details
⏰ Time Window
Codes are valid for 30 seconds to account for clock drift and network delays
🔢 Code Length
Standard is 6 digits (1,000,000 combinations) for balance of security and usability
🔐 Algorithm
HMAC-SHA1 with time-based counter (RFC 6238 standard)
🎯 Entropy
Secret keys are typically 160 bits (20 bytes) for strong security