Secure and Efficient Cloud Data Deduplication with Ownership Management

Data deduplication has been widely used in cloud storage to reduce storage space and communication overhead by eliminating redundant data and storing only one copy for them. In order to achieve secure data deduplication, the convergent encryption scheme and many of its variants are proposed. However, most of these schemes do not consider or cannot address the efficiently dynamic ownership changes and the secure Proof-of-Ownership (PoW), simultaneously. In this paper, we propose a secure data deduplication scheme with efficient PoW process for dynamic ownership management. Specially, our scheme supports both cross-user file-level and inside-user block-level data deduplication. During the file-level deduplication, we construct a new PoW scheme to ensure the tag consistency and achieve the mutual ownership verification. Moreover, we design a lazy update strategy to achieve efficient ownership management. For inside-user block-level deduplication, the user-aided key is used to realize convergent key management and reduce the key storage space. Finally, the security and performance analysis demonstrate that our scheme can ensure data confidentiality and tag consistency, and it is efficient in data ownership management.