Two-Factor Authentication Best Practices

Best practices for implementing secure two-factor authentication using SMS and voice verification.

Why Two-Factor Authentication?

Two-factor authentication (2FA) adds an extra layer of security to your applications by requiring users to verify their identity using a second factor, typically a code sent via SMS or voice call.

Best Practices

1. Use Short-Lived Codes - Codes should expire within 5-10 minutes - Generate codes that are easy to read (avoid similar characters like 0/O)

2. Rate Limiting - Limit the number of verification attempts - Implement exponential backoff for failed attempts - Block suspicious activity automatically

3. User Experience - Provide clear instructions - Show countdown timers for code expiration - Offer alternative verification methods (voice, email)

4. Security Considerations - Never log verification codes - Use secure random number generation - Implement proper session management

Implementation Example

const client = new ViteMobile({ apiKey: 'your-api-key' });

// Send verification code const verification = await client.verify.send({ to: '+1234567890', method: 'sms' });

// Verify the code const isValid = await client.verify.check({ requestId: verification.requestId, code: userEnteredCode }); ```

Learn More

For more detailed information, check our [2FA documentation](/developers/verify).