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In this paper, the authors will present new challenges to the large amounts of data storage in cloud computing, namely Reliability and security. Recent progress in the research area will be briefly reviewed. It has been proved that it is impossible to satisfy consistency, availability, and partitioned-tolerance simultaneously. Trade-off becomes crucial among these factors to choose a suitable data access model for a distributed storage system. This paper primarily aims to highlight the major security issues which are contentious and may delay its adoption. So they carry out a survey to investigate the security mechanisms that are enforced by major cloud service providers.
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