Farming plays an important part of living as it is the primary source. Being in an open environment, the risk increases to maintain the productivity and effectiveness of food as farmers need to face the changing environment and weather conditions. The researchers are facing challenges to work on the automation and security of the farms, especially in the large-scale farms. Farmers need to maintain the moisture level, pH level of soil, monitor the growth and keep an update about the weather conditions. Many researchers have invented and suggested smart systems with the help of IoT and AI. These have given rise to the increase in data on the cloud which needs security and protection. So, the present study mainly focuses on the research done by the researchers for the security systems of smart farming. Also, the study deals with the view of researchers towards the smart farming. The primary goal of the research is to get an overview to build smart farm security systems using recent technology. The present study also aims to explore the various current security measures that have been deployed in smart farming. It also aims to study the scope and limitation of the current security system of farming.