AuthorsC. Boyd, G. T. Davies, K. Gjøsteen, H. Raddum and M. Toorani
TitleDefinitions for Plaintext-Existence Hiding in Cloud Storage
Project(s)Cryptography Section
Publication TypeProceedings, refereed
Year of Publication2018
Conference NameProceedings of the 13th International Conference on Availability, Reliability and Security
PublisherACM Press
Place PublishedNew York, NY, USA
ISBN Number9781450364485
KeywordsCloud based storage, information systems, security and privacy

Cloud storage services use deduplication for saving bandwidth and storage. An adversary can exploit side-channel information in several attack scenarios when deduplication takes place at the client side, leaking information on whether a specific plaintext exists in the cloud storage. Generalising existing security definitions, we introduce formal security games for a number of possible adversaries in this domain, and show that games representing all natural adversarial behaviors are in fact equivalent. These results allow users and practitioners alike to accurately assess the vulnerability of deployed systems to this real-world concern.

Citation Key26353

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