Private Functional Encryption: Indistinguishability-Based Definitions and Constructions from Obfuscation
Private Functional Encryption: Indistinguishability-Based Definitions and Constructions from Obfuscation
dc.contributor.author | Arriaga,A | en |
dc.contributor.author | Manuel Barbosa | en |
dc.contributor.author | Farshim,P | en |
dc.date.accessioned | 2017-12-22T10:02:32Z | |
dc.date.available | 2017-12-22T10:02:32Z | |
dc.date.issued | 2016 | en |
dc.description.abstract | Private 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.identifier.uri | http://repositorio.inesctec.pt/handle/123456789/4741 | |
dc.identifier.uri | http://dx.doi.org/10.1007/978-3-319-49890-4_13 | en |
dc.language | eng | en |
dc.relation | 5604 | en |
dc.rights | info:eu-repo/semantics/openAccess | en |
dc.title | Private Functional Encryption: Indistinguishability-Based Definitions and Constructions from Obfuscation | en |
dc.type | conferenceObject | en |
dc.type | Publication | en |
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