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arXiv · 1310.0054

Towards Optimal Secure Distributed Storage Systems with Exact Repair

Ravi Tandon·SaiDhiraj Amuru·T. Charles Clancy·R. Michael Buehrer
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Abstract

Distributed storage systems in the presence of a wiretapper are considered. A distributed storage system (DSS) is parameterized by three parameters (n, k,d), in which a file stored across n distributed nodes, can be recovered from any k out of n nodes. If a node fails, any d out of (n-1) nodes help in the repair of the failed node. For such a (n,k,d)-DSS, two types of wiretapping scenarios are investigated: (a) Type-I (node) adversary which can wiretap the data stored on any l 4, we present extensions of these results to a (n, n-1,n-1)-DSS, in presence of a Type-II adversary that can observe the repair data of any l=(n-2) nodes. The key technical contribution of this work is in developing novel information theoretic converse proofs for the Type-II adversarial scenario. From our results, we show that in the presence of Type-II attacks, the only efficient point in the storage-vs-exact-repair-bandwidth tradeoff is the MBR (minimum bandwidth regenerating) point. This is in sharp contrast to the case of a Type-I attack in which the storage-vs-exact-repair-bandwidth tradeoff allows a spectrum of operating points beyond the MBR point.

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Ravi Tandon, SaiDhiraj Amuru, T. Charles Clancy, R. Michael Buehrer. 2014-02-19. Towards Optimal Secure Distributed Storage Systems with Exact Repair. https://doi.org/10.1109/tit.2016.2544340

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