Cryptology ePrint Archive: Report 2020/1468

Secure Cloud Auditing with Efficient Ownership Transfer (Full Version)

Jun Shen and Fuchun Guo and Xiaofeng Chen and Willy Susilo

Abstract: Cloud auditing with ownership transfer is a provable data possession scheme meeting verifiability and transferability simultaneously. In particular, not only cloud data can be transferred to other cloud clients, but also tags for integrity verification can be transferred to new data owners. More concretely, it requires that tags belonging to the old owner can be transformed into that of the new owner by replacing the secret key for tag generation while verifiability still remains. We found that existing solutions are less efficient due to the huge communication overhead linear with the number of tags. In this paper, we propose a secure auditing protocol with efficient ownership transfer for cloud data. Specifically, we sharply reduce the communication overhead produced by ownership transfer to be independent of the number of tags, making it with a constant size. Meanwhile, the computational cost during this process on both transfer parties is constant as well.

Category / Keywords: Cloud storage, Integrity auditing, Ownership transfer

Original Publication (with minor differences): 25th European Symposium on Research in Computer Security (ESORICS 2020)

Date: received 22 Nov 2020, last revised 2 Dec 2020

Contact author: demon_sj at 126 com,fuchun@uow edu au,xfchen@xidian edu cn,wsusilo@uow edu au

Available format(s): PDF | BibTeX Citation

Version: 20201203:013404 (All versions of this report)

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