Introduction.- Secure communications in 5G and IoT networks.- Authentication and key exchange protocols in 5G and IoT networks.- Formal security analysis on security protocols for 5G and IoT networks.- Developing secure communication systems or environments.- Security risk management and assessment in 5G and IoT networks.- Usability and human factor issues and studies with 5G and IoT networks.- Privacy and trust in 5G and IoT networks.- Infrastructure for secure communications.- Balancing security and quality services in 5G and IoT networks.- Emerging security issues in 5G and IoT networks.- Intelligent IoT in 5G Security.- Practical Aspects for the Integration of 5G Networks and IoT Applications security issues.- Secure 5G IoT use case.- Blockchain used 5G IoT applications.- Conclusion.