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International audienceModern storage systems are often faced with complextrade-offs between the confidentiality, availability, and performancethey offer their users. Secret sharing is a data encoding technique thatprovides information-theoretically provable guarantees onconfidentiality unlike conventional encryption. Additionally, secretsharing provides quantifiable guarantees on the availability of theencoded data. We argue that these properties make secret sharing-basedencoding of data particularly suitable for the design of increasinglypopular and important distributed archival data stores. Theseguarantees, however, come at the cost of increased resource consumptionduring reads/writes. Consequently, it is desirable that such a storagesystem employ techniques that could dynamically transform datarepresentation to operate the store within required confidentiality,availability, and performance regimes (or budgets) despite changes tothe operating environment. Since state-of-the-art transformationtechniques suffer from prohibitive data transfer overheads, we develop amiddleware for dynamic data transformation. Using this, we propose thedesign and operation of a secure, available, and tunable distributedarchival store called FlexArchive. Using a combination of analysis andempirical evaluation, we demonstrate the feasibility of our archivalstore. In particular, we demonstrate that FlexArchive can achievedynamic data re-configurations in significantly lower times (factor of50 or more) without any sacrifice in confidentiality and with anegligible loss in availability (less than 1%)

Middleware for a Re-configurable Distributed Archival Store Based on Secret Sharing