Abstract
SummaryMobile networks integrate cloud computing to impair the weaknesses of the mobile terminals. With mobile cloud storage, mobile users can fully enjoy the advantages from both mobile networks and cloud storage. However, a major concern of mobile users is how to guarantee the integrity of their outsourced data. Taking into account the mobility of mobile devices, in this paper, we propose a shared data integrity verification protocol with identity privacy preserving, named SDIVIP2, for mobile cloud storage. In the construction of SDIVIP2, the dynamic group key agreement technique is employed for key sharing among a group of mobile users and the proxy re‐signature mechanism is utilized to update tags efficiently when users in the group change. In this new protocol, a third party auditor is able to verify the correctness of cloud data without the knowledge of mobile users' identities during the data integrity checking process. Performance analysis demonstrates that SDIVIP2 outperforms the existing schemes in the sense that it can significantly enhance the efficiency of mobile users' joining and leaving a group. Copyright © 2015 John Wiley & Sons, Ltd.
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