Background: People are using internet anywhere and anytime. IOT is the field which connect people with the devices, which allow people to communicate with connected devices at anytime and anywhere. It has facilitate our life style very deeply. It is very innovative invented technology which facilitate every user to control all connected devices remotely automatically. It facilitates various services to the user at various platforms and applications. Internet of things (IOT) constitutes one of the most important technological development in the last decade in which all smart and heterogeneous devices are connected. These devices are able to communicate to each other through internet. but various challenges are there in such a innovative technology. Security is the big challenge with this technology. If the security leaks then there will be big harm to the sensitive information of the user. The traditional security management mechanisms are not able to apply on IOT because of heterogeneity in the connected devices. There should be flexible security mechanisms are required to handle dynamic and heterogenic designs. In this paper, various security issues are represented along with the remedies.