Please use this identifier to cite or link to this item:
http://repositorio.inesctec.pt/handle/123456789/4741
Title: | Private Functional Encryption: Indistinguishability-Based Definitions and Constructions from Obfuscation |
Authors: | Arriaga,A Manuel Barbosa Farshim,P |
Issue Date: | 2016 |
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. |
URI: | http://repositorio.inesctec.pt/handle/123456789/4741 http://dx.doi.org/10.1007/978-3-319-49890-4_13 |
metadata.dc.type: | conferenceObject Publication |
Appears in Collections: | HASLab - Articles in International Conferences |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
P-00M-5X4.pdf | 614.3 kB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.