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sec-cs: Getting the Most out of Untrusted Cloud Storage

  • We present sec-cs, a hash-table-like data structure for contents on untrusted storage that is provably secure and storage-efficient. We achieve authenticity and confidentiality with zero storage overhead using deterministic authenticated encryption. State-of-the-art data deduplication approaches prevent redundant storage of shared parts of different contents irrespective of whether relationships between contents are known a priori. Instead of just adapting existing approaches, we introduce novel (multi-level) chunking strategies, ML-SC and ML-CDC, which are significantly more storage-efficient than existing approaches in presence of high redundancy. We prove sec-cs's security, publish an implementation, and present evaluation results indicating suitability for, e.g., future backup systems that should preserve many versions of files on little available storage.

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Author:Dominik Leibenger, Christoph Sorge
Parent Title (English):2017 IEEE 42nd Conference on Local Computer Networks
Place of publication:Piscataway, NJ
Document Type:Conference Proceeding
Date of Publication (online):2018/03/19
Publishing Institution:Deutsches Forschungsinstitut für öffentliche Verwaltung
Release Date:2018/03/19
Reviewed Document?:Ja
First Page:623
Last Page:631
Documents of the German Research Institute for Public Administration (FÖV):Sonstige Schriften
Licence (German):License LogoUrheberrechtlich geschützt