Cloud computing has raised IT to newer limits by contribution the market environment data storage and volume with springy scalable computing processing power to match elastic demand supply, with reducing capital expenditure. Usually, cloud computing services are delivered by a third party provider who owns the infrastructure. Cloud computing offers an innovative business model for organizations to adopt IT services without upfront investment. Security is one of the major issues which hamper the growth of the cloud. Today, leading players, such as Amazon, Google, IBM, Microsoft, and salesforce.com offer their cloud infrastructure for services.