Smart city areas have been distinguished as zones which are urbanized and use assorted sorts of electronic information assortment sensors that are used to supervise assets and resources effectively. Keen meters are a unit of brilliant urban communities, and they gather data about clients and their utilization designs. Thus, the Internet of Things (IoT) being at a consistent advancement has incited various clients into having their information gathered from shrewd meters, put away on cloud workers. This is a method of sparing expenses and time engaged with getting to the information. Despite that, the cloud helped IoT faces protection and security issues. This is because of the cloud workers having an untrusted nature. Because of this, it is basic for the information collected from the shrewd meters be encoded heretofore redistributing it to the cloud worker. In any case, having encoded information in the cloud worker prompts an intricacy with regards to getting to the information. For clients who are on an alternate public key framework, it gets nonsensical for the clients to initially download the whole information on the cloud so as to get to the necessary information. In this article we proposed efficient public key cryptosystem for Smart city using near-ring.