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The data that is stored and/or transmitted on the Internet has been called "the blood of the IT". Along with the infrastructure and network based applications, data storage has been recognized as one of the major dimensions of information technology. The prosperity of Cloud Computing requires the moving from server-attached storage to distributed storage. Along with variant advantages, the distributed storage also poses new challenges in creating a secure and reliable data storage and access facility over insecure or unreliable service providers. The security of data stored in the cloud is one of the challenges to be addressed before the novel pay-as-you-go business model is applied widely. In this research, we revealed the vulnerability in the Amazon's AWS cloud and discussed technical approaches towards potential effective solutions.