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Improving the Resistance to Side-Channel Attacks on Cloud Storage Services

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4 Author(s)
Olivier Heen ; Technicolor, Cesson-Sevigne, France ; Christoph Neumann ; Luis Montalvo ; Serge Defrance

Providers of cloud storage services usually apply deduplication across multiple user accounts in order to optimize savings of both upload bandwidth and storage space. However, deduplication can be used as a side channel by an adversary for obtaining sensitive information about other user's data. We propose a new gateway-based deduplication model that lets the storage service provider apply efficient deduplication while substantially reducing the risk of information leakage. We suppose that the cloud storage service is provided by a Network Service Provider that also ships advanced gateways to its customers. We discuss why it is much harder for an adversary to infer deduplication from the gateway than from a fully controlled host.

Published in:

2012 5th International Conference on New Technologies, Mobility and Security (NTMS)

Date of Conference:

7-10 May 2012