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A Note on "Enhancing cloud storage security against a new replay attack with an efficient public auditing scheme"

With the rapid development of cloud computing, more and more people choose to store their data on the cloud. To solve the problem of cloud data integrity, a wide variety of auditing schemes have been put forward. However, all of the above auditing schemes cannot be against the new replay attack. In order to solve this problem, Fan et al. proposed an efficient public auditing scheme to enhance cloud storage security against a new replay attack. In this note, we prove that the auditing scheme in the above-mentioned paper is not secure. We give the analysis process to show the malicious cloud can pass the auditor's verification even if it has deleted or modified user's data.