Cryptology ePrint Archive: Report 2012/554

Security weakness in the Proof of Storage with Deduplication

Youngjoo Shin, Junbeom Hur, Kwangjo Kim

Abstract: Achieving both security and efficiency is the challenging issue for a data outsourcing service in the cloud computing. Proof of Storage with Deduplication (POSD) is the first solution that addresses the issue for the cloud storage. However, the validity of the POSD scheme stands on the strong assumption that all clients are honest in terms of generating their keys. We present insecurity of the scheme under new attack model that malicious clients exploit dishonestly manipulated keys. We also propose an improvement of the POSD scheme to mitigate our attack.

Category / Keywords: cryptographic protocols / Cloud storage, data security, proof of data possession, proof of retrievability, proof of ownership, data deduplication

Date: received 25 Sep 2012, last revised 25 Sep 2012

Contact author: s youngjoo at kaist ac kr

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Version: 20120927:133909 (All versions of this report)

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