Cloud Computing is fast gaining popularity today with its scalable, flexible and on-demand service provision. It brings cost saving and agility to organization with pay-as-you-go approach. Abundant resources are available and the user has a huge range to select from. Cloud facilitates virtualization, simplification, automation and accelerated delivery of application and services for a sustainable business advantage. As much as the technological benefit, cloud computing also has security issues. Security in cloud computing is essential for providing quality of service.