Abstract: From the beginning of the 21st century, the entire world suffers from two critical problems: the growth of the world population and the improvement of life expectancy of people owing to the development of healthcare facilities. This has ultimately led to urbanization where a lot of people migrated to cities in search of better prospects. To facilitate those migrating into these cities and with the purpose of better provision of city services, smart cities have emerged thereby connecting everything within the city with the aid of a complex set of technologies. The Internet of Things (IoT) is the fundamental building block of smart cities applied in a variety of smart city solutions, offering real-time information exchange and facilitating ubiquitous connectivity. As IoT is a novel technology that is still in its infancy age and requiring continuous internet connectivity, it paves way for never-ending cyber-attacks targeting smart city services and ultimately endangering the lives of city residents. On the other hand, the security of smart city solutions has always been neglected during the development phase which also endangers the entire city’s ecosystem resulting into cyber-attacks from multiple attack vectors. In this chapter, we are providing a brief review of security enhancement capabilities and utilities that can cope with smart cities for the purpose of improving their security against cyber-attacks and safeguarding the privacy of city dwellers.