Affiliations: [a] Department of Computer Science and Engineering, Shanghai Jiao Tong University, Shanghai, China. zhanghuajun.cn@gmail.com | [b] School of Computer Science and Software Engineering, East China Normal University, Shanghai, China. {zfcao, dongxiaolei, jcshen}@sei.ecnu.edu.cn
Correspondence:
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Address for correspondence: School of Computer Science and Software Engineering, East China Normal University, Shanghai, China.
Abstract: For disaster recovery, we store backups of a file in several positions far away from each other. If we delegate this task to an untrusted cloud service provider, a verification method is desired. In this paper, we construct a generic transformation from “proof of retrievability” to “proof of multicopy”. We present this work in two stages. In the first stage, we propose a generic protocol of “proof of file position” based on an arbitrary secure “proof of retrievability” protocol. In the second stage, we propose a “proof of multicopy” protocol based on our “proof of file position” protocol. Both of our protocols are provably secure.
Keywords: proof of retrievability, proof of file position, proof of multicopy
