2.1. Overview 2.2. How QR Code Authentication Works 2.3. Advantages and Limitations 3. Time-Based One-Time Password (TOTP) 3.1. Overview 3.2. TOTP Algorithm 3.3. Integration with QR Code Authentication 4. Design and Implementation 4.1. System Architecture 4.2. QR Code Generation and Scanning 4.3. TOTP Generation and Verification 4.4. User Interface 5. Security Considerations 5.1. Threat Model 5.2. Mitigating Attacks 5.3. Secure Transmission and Storage 6. Performance Evaluation 6.1. Metrics 6.2. Benchmarking 7. Deployment and Integration 7.1. Deployment Strategies 7.2. Integration with Existing Systems 8. User Experience and Usability 8.1. User Interface Design 8.2. User Training and Onboarding 8.3. Usability Testing 9. Case Studies 9.1. Case Study 1: Implementation in a Banking System 9.2. Case Study 2: Implementation in an E-commerce Platform 10. Conclusion
