Write a research work on the topic titled: Smart Cities and IoT Security, Safeguarding Urban Infrastructure. State not less than $15$ references for this work and using the outline below:

I. Introduction

A$.$Definition of Smart Cities

B$.$ Importance of IoT in Smart Cities

C$.$ Thesis Statement

II$.$ Overview of Smart Cities

A$.$ Key Features of Smart Cities

B$.$ Role of IoT in Urban Infrastructure

III. IoT Security Challenges in Smart Cities

A$.$ Vulnerabilities in IoT Devices

B$.$ Threats to Urban Infrastructure

C$.$ Case Studies of IoT Security Breaches

IV$.$ Strategies for Enhancing IoT Security in Smart Cities

A$.$Implementing Robust Security Protocols

B$.$ Designing Secure IoT Architectures

C$.$ Regulatory and Policy Measures

D$.$ Collaboration Between Public and Private Sectors

V$.$Future Directions in Smart Cities and IoT Security

A$.$ Emerging Technologies in IoT Security

B$.$The Role of Public Awareness and Education

C$.$Future Challenges and Opportunities

VI$.$Conclusion

A$.$Summary of Key Points

B$.$Restating the Thesis

C$.$Final Thoughts