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Cloud Computing as the on-demand and remote provision of computational resources has been eagerly waited for a long time as a computing utility. It helps users to store their data in the cloud and enjoy the high quality service. However, users do not have physical possession on their own data, hence it is indispensable to create mechanisms on how to protect the security of the data stored. Thus, some auditing protocols are introduced to ensure authenticity and integrity of the outsourced data. Wang et al. proposed a public auditing protocol in 2010 and argued that it can resist against various known attacks. In this paper, the authors analyze the protocol and find serious security flaws in their protocol.
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