Please use this identifier to cite or link to this item: http://repositorio.inesctec.pt/handle/123456789/4741
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dc.contributor.authorArriaga,Aen
dc.contributor.authorManuel Barbosaen
dc.contributor.authorFarshim,Pen
dc.date.accessioned2017-12-22T10:02:32Z-
dc.date.available2017-12-22T10:02:32Z-
dc.date.issued2016en
dc.identifier.urihttp://repositorio.inesctec.pt/handle/123456789/4741-
dc.identifier.urihttp://dx.doi.org/10.1007/978-3-319-49890-4_13en
dc.description.abstractPrivate functional encryption guarantees that not only the information in ciphertexts is hidden but also the circuits in decryption tokens are protected. A notable use case of this notion is query privacy in searchable encryption. Prior privacy models in the literature were fine-tuned for specific functionalities (namely, identity-based encryption and inner-product encryption), did not model correlations between ciphertexts and decryption tokens, or fell under strong uninstantiability results. We develop a new indistinguishability-based privacy notion that overcomes these limitations and give constructions supporting different circuit classes and meeting varying degrees of security. Obfuscation is a common building block that these constructions share, albeit the obfuscators necessary for each construction are based on different assumptions. In particular, we develop a composable and distributionally secure hyperplane membership obfuscator and use it to build an inner-product encryption scheme that achieves an unprecedented level of privacy, positively answering a question left open by Boneh, Raghu-nathan and Segev (ASIACRYPT 2013) concerning the extension and realization of enhanced security for schemes supporting this functionality.en
dc.languageengen
dc.relation5604en
dc.rightsinfo:eu-repo/semantics/openAccessen
dc.titlePrivate Functional Encryption: Indistinguishability-Based Definitions and Constructions from Obfuscationen
dc.typeconferenceObjecten
dc.typePublicationen
Appears in Collections:HASLab - Articles in International Conferences

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