Through the rapid evolution of information technology, there are many innovative services and products bring a lot of convenience for people especially BCloud Computing^. The cloud computing provides users more than personal computer's storage resources and calculate ability. Nowadays the most consume hard drive space or calculate resources are belong to multimedia applications, such like HD videos, HD computer games and so on. Because of the reason of the requirement, the cloud computing technology also develop multimedia cloud. The multimedia cloud is evolved from media cloud and multimediaaware cloud, combine with the highly calculate ability, high quality of service and virtually unlimited storage space. Users can put all the multimedia content or games into the multimedia cloud. But there is still a harassment, the BInformation Security^. Before users can use multimedia cloud, they must go through an insecure network environment between cloud services and user's equipment. Malicious attackers usually attack this insecure section to capture user's information. Besides the privacy of the user's data in the multimedia cloud is also a fatal reason that why users don't use this convenience and powerful service. In this article, we provide a smart card based secure authentication mechanism and a protect user's data authorization framework. We expect the framework can protect users' privacy and their data.
With the evolution of software technology, companies require more highperformance hardware to enhance their competitiveness. Cloud computing is the result of distributed computing and grid computing processes and is gradually being seen as the solution to the companies. Cloud computing can virtualizes existing software and hardware to reduce costs. Thus, companies only require high Internet bandwidth and devices to access cloud service on the Internet. This would decrease many overhead costs and the number of IT staff required. When many companies rent a cloud service simultaneously, this is called a multitenancy cloud service. However, how to access resource safely is important if adopt multi-tenancy cloud computing technology. The cloud computing environment is vulnerable to network-related attacks. This research improves the role-based access control authorization mechanism and combines it with attribute check mechanism to determine which tenant that user can access. The enhanced authorization can improve the safety of cloud computing services and protected the data privacy.
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