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Erschienen in:
2013 | OriginalPaper | Buchkapitel
On the Semantic Security of Functional Encryption Schemes
verfasst von : Manuel Barbosa, Pooya Farshim
Erschienen in: Public-Key Cryptography – PKC 2013
Verlag: Springer Berlin Heidelberg
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Functional encryption (FE) is a powerful cryptographic primitive that generalizes many asymmetric encryption systems proposed in recent years. Syntax and security definitions for FE were proposed by Boneh, Sahai, and Waters (BSW) (TCC 2011) and independently by O’Neill (ePrint 2010/556). In this paper we revisit these definitions, identify several shortcomings in them, and propose a new definitional approach that overcomes these limitations. Our definitions display good compositionality properties and allow us to obtain new feasibility and impossibility results for adaptive token-extraction attack scenarios that shed further light on the potential reach of general FE for practical applications.