Dash et al Int

ABSTRACT Cloud computing is a distributed computing environment that provides on demand services to the users for deploying their computational needs in a virtualized environment without the knowledge of technical infrastructure. Due to reliability, scalability, high performance and low band width most of the organizations are running their applications in cloud. The cloud service providers provide the services to the registered cloud users on payment basic across the glove. The cloud services are basically categorized as SaaS, PaaS, and IaaS. The services are available to the users depending on cloud deployment and the SLA (service level agreements) between the service providers and the users. Providing security to the users and trust into cloud environment is the responsibility of the cloud service providers. The main objective of this paper is to provide a clear idea about the cloud service models and outline the security issues in the service models