Abstract
Cloud computing is a fast-growing technology which supplies scalable, innovative, and efficient business models. However, cloud computing is not fully trusted, and the security of the data outsourced in cloud storage needs to be guaranteed. One of the hottest issues is how to ensure the integrity of the data in cloud storage. Until now, many researchers have proposed lots of provable data possession (PDP) schemes to deal with the problem of data integrity audition. Nevertheless, very little effort has been devoted to preserve the data uploader’s privacy while auditing the integrity of data shared in a group. To overcome the shortcoming, we propose a novel certificateless PDP protocol to efficiently audit the integrity of data shared in a workgroup with user privacy preserving. Due to the inherent structural advantage of the certificateless crypto mechanism, our PDP scheme eliminates the key escrow problem and the certificate management problem simultaneously. Moreover, the audition process in our scheme does not need any user’s identity which helps to keep the anonymity of data uploader. We give for our scheme a detailed security proof and efficiency analysis. Experiment results of performance evaluation demonstrate that our new scheme is very efficient and feasible.
Highlights
Cloud computing has continued to provide scalable and low-cost services to user. e core advantage of cloud storage is dynamic scalability that allows the cloud storage services to deal with increasing amounts of data. erefore, a vast number of organizations and people would like to buy cloud storage service for data maintenance and management as one of fundamental investments
(2) We propose the concrete provable data possession (PDP) scheme based on certificateless cryptography (CLC) for group shared data with user privacy preserving
Li et al [36] presented a PDP protocol of group shared data based on certificateless cryptography, but the scheme lost the user privacy preservation feature
Summary
Cloud computing has continued to provide scalable and low-cost services to user. e core advantage of cloud storage is dynamic scalability that allows the cloud storage services to deal with increasing amounts of data. erefore, a vast number of organizations and people would like to buy cloud storage service for data maintenance and management as one of fundamental investments. Erefore, PDP scheme should keep confidential of uploader’s identity to TPA Aim to this goal, Wang et al [23] proposed a concrete PDP protocol with the notion of user privacy preserving for shared data. (1) We present the security model of certificateless-based PDP scheme for group shared data with user privacy protection. Wang et al [31] first presented a CLC-based PDP scheme for auditing cloud data In this scheme, KGC computed the partial key for each user, but KGC did not know the user’s secret value, so the user’s private key was protected against KGC which avoided the key escrow problem. Li et al [36] presented a PDP protocol of group shared data based on certificateless cryptography, but the scheme lost the user privacy preservation feature. Wu et al [39] designed a PDP scheme for multiusers setting with user privacy preserving, but the overheads of both communication and computation were too heavy especially in the challenge phase
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