期刊
IEEE TRANSACTIONS ON COMPUTERS
卷 65, 期 12, 页码 3631-3645出版社
IEEE COMPUTER SOC
DOI: 10.1109/TC.2016.2560812
关键词
Cloud storage; dynamic proof of storage; deduplication
资金
- US National Science Foundation [1217611]
- Key Laboratory of Aerospace Information Security and Trusted Computing, Ministry of Education
- National Natural Science Foundation of China [61272451, 61572380, U1536204]
- Major State Basic Research Development Program of China [2014CB340600]
- National High Technology Research and Development Program (863 Program) of China [2014BAH41B00]
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1217611] Funding Source: National Science Foundation
Dynamic Proof of Storage (PoS) is a useful cryptographic primitive that enables a user to check the integrity of outsourced files and to efficiently update the files in a cloud server. Although researchers have proposed many dynamic PoS schemes in single-user environments, the problem in multi-user environments has not been investigated sufficiently. A practical multi-user cloud storage system needs the secure client-side cross-user deduplication technique, which allows a user to skip the uploading process and obtain the ownership of the files immediately, when other owners of the same files have uploaded them to the cloud server. To the best of our knowledge, none of the existing dynamic PoSs can support this technique. In this paper, we introduce the concept of deduplicatable dynamic proof of storage and propose an efficient construction called DeyPoS, to achieve dynamic PoS and secure cross-user deduplication, simultaneously. Considering the challenges of structure diversity and private tag generation, we exploit a novel tool called Homomorphic Authenticated Tree (HAT). We prove the security of our construction, and the theoretical analysis and experimental results show that our construction is efficient in practice.
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