Design Goals Definitions of Our Auditing Scheme Enabling Privacy-Preserving Auditable Regenerating Codes: Regenerating codes are first introduced for distributed storage to reduce the repair bandwidth. Viewing cloud storage to be a collection of storage servers, data file n is encoded and stored redundantly across these servers. Then can be retrieved F F by connecting to any servers, which is termed the MDS2-property. k-out-of-n When data corruption at a server is detected, the client will contact healthy ℓ and download bits from each server, thus regenerating the corrupted β′ blocks without recovering the entire original file. Design Goals: To correctly and efficiently verify the integrity of data and keep the stored file available for cloud storage, our proposed auditing scheme should achieve the following properties: to allow TPA to verify the intactness of the data in the cloud Public Auditability: • on demand without introducing additional online burden to the data owner. to ensure that the cloud server can never pass the auditing Soundness: • Storage procedure except when it indeed manage the data intact. owner’s to ensure that neither the auditor nor the proxy can derive Privacy Preserving: • data content from the auditing and reparation process. users’
Design Goals Definitions of Our Auditing Scheme Enabling Privacy-Preserving Auditable Regenerating Codes: Regenerating codes are first introduced for distributed storage to reduce the repair bandwidth. Viewing cloud storage to be a collection of n storage servers, data file F is encoded and stored redundantly across these servers. Then F can be retrieved by connecting to any k-out-of-n servers, which is termed the MDS2-property. When data corruption at a server is detected, the client will contact ℓ healthy and download β′ bits from each server, thus regenerating the corrupted blocks without recovering the entire original file. Design Goals: To correctly and efficiently verify the integrity of data and keep the stored file available for cloud storage, our proposed auditing scheme should achieve the following properties: • Public Auditability: to allow TPA to verify the intactness of the data in the cloud on demand without introducing additional online burden to the data owner. • Storage Soundness: to ensure that the cloud server can never pass the auditing procedure except when it indeed manage the owner’s data intact. • Privacy Preserving: to ensure that neither the auditor nor the proxy can derive users’ data content from the auditing and reparation process.