ABSTRACT

Internet is a "network of networks" that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and other technologies. Cloud computing [1] is a new flavor of computing where our trend of using internet changes. It makes a virtual pool of resources such as storage, CPU, networks and memory to fulfill the user’s resource requirement and provides on demand (pay per use) hardware and software services without barriers. It can be named as dynamic computing because it provides resources, when required. Cloud Computing manages the pool of resources automatically and dynamically through software and hardware. Various businesses form their cloud for the users to provide pay per use services. Users are required to access the cloud according to the service. In this way, user can get benefited from the proprietary cloud on cheap prices but it is difficult for the user to find the cloud that can fulfill his demand. It is also not safe for cloud to cloud communication without trust. To resolve such difficulties and various other issues, it is required to extend the trusted cloud domain for accessing the compatible services provided by other clouds.