Secure and efficient privacy-preserving public auditing scheme for cloud storage

Cloud computing poses many challenges on integrity and privacy of users’ data though it brings an easy, cost-effective and reliable way of data management. Hence, secure and efficient methods are needed to ensure integrity and privacy of data stored at the cloud. Wang et al. proposed a privacy-preserving public auditing protocol in 2010 but it is seriously insecure. Their scheme is vulnerable to attacks from malicious cloud server and outside attackers regarding to storage correctness. So they proposed a scheme in 2011 with an improved security guarantee but it is not efficient. Thus, in this paper, we proposed a scheme which is secure and with better efficiency. It is a public auditing scheme with third party auditor (TPA), who performs data auditing on behalf of user(s). With detail security analysis, our scheme is proved secure in the random oracle model and our performance analysis shows the scheme is efficient.

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• Cloud computing poses security challenges in owners’ data though it brings some fascinating advantages for users.
• Integrity mechanism should be in place to avoid data modifications from untrusted service providers or malicious attackers.
• We propose existentially unforgable, privacy-preserving and multi tasking public auditing scheme.
• We give full security proof of storage correctness and privacy-preserving guarantee.
• The performance analysis we made shows our scheme is efficient i.e., computation and communication overhead is optimal.