Proof of Storage with Corruption Identification and Recovery for Dynamic Group Users

With the widespread deployment of cloud storage, protecting the security and privacy of outsourced data becomes increasingly important. In the last decade, provable data possession/retrievability schemes with different flavors, such as public variability, efficient update, user revocation, protecting privacy, have been designed to protect the rights and interests of cloud users. Although extensive research have been conducted in protecting the security and privacy of group cloud users, there is still a lack of a way to efficiently identify the destroyed data and actualize cloud disaster recovery. In response to these problems, a publicly verifiable proof of storage scheme is proposed for group cloud users in this paper. We provide the construction details, where invalid files can be efficiently identificated and even recovered after being detected by a trusted third-party auditor. Further analysis indicate that the designed scheme is secure for dynamic group user data sharing.