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Abstract: We address the problem of securing distributed storage systems againsteavesdropping and adversarial attacks. An important aspect of these systems isnode failures over time, necessitating, thus, a repair mechanism in order tomaintain a desired high system reliability. In such dynamic settings, animportant security problem is to safeguard the system from an intruder who maycome at different time instances during the lifetime of the storage system toobserve and possibly alter the data stored on some nodes. In this scenario, wegive upper bounds on the maximum amount of information that can be storedsafely on the system. For an important operating regime of the distributedstorage system, which we call the -bandwidth-limited regime-, we show that ourupper bounds are tight and provide explicit code constructions. Moreover, weprovide a way to short list the malicious nodes and expurgate the system.



Autor: Sameer Pawar, Salim El Rouayheb, Kannan Ramchandran

Fuente: https://arxiv.org/







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