Cloud computing provides the ability to utilize scalable, distributed computing environments via the Internet. Over the years, cloud computing has grown from being a promising business concept to a fast growing sector in IT organizations. It has emerged as a promising hosting platform that allows an intelligent usage of a collection of applications, information and infrastructure comprised of pools of computer, network and storage resources. However, enterprise customers are still reluctant to deploy their business in the cloud. Security is one of the key factor which hampers growth of cloud computing.