Cloud makes data storage very smart. It provides enormous amount of space to store the user's data. These data are instantly available for the users at any time and it reduces the cost with respect to hardware support, technical experts available and license of the database. It leverages the small and medium scale enterprise straight away to start their business. Nevertheless cloud has many advantages; enterprises are undecided to deploy their data in the cloud storage, because data security issue is the top concern in Cloud Storage (CS).