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Erschienen in:
2010 | OriginalPaper | Buchkapitel
Fully Secure Functional Encryption: Attribute-Based Encryption and (Hierarchical) Inner Product Encryption
verfasst von : Allison Lewko, Tatsuaki Okamoto, Amit Sahai, Katsuyuki Takashima, Brent Waters
Erschienen in: Advances in Cryptology – EUROCRYPT 2010
Verlag: Springer Berlin Heidelberg
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We present two fully secure functional encryption schemes: a fully secure attribute-based encryption (ABE) scheme and a fully secure (attribute-hiding) predicate encryption (PE) scheme for inner-product predicates. In both cases, previous constructions were only proven to be selectively secure. Both results use novel strategies to adapt the dual system encryption methodology introduced by Waters. We construct our ABE scheme in composite order bilinear groups, and prove its security from three static assumptions. Our ABE scheme supports arbitrary monotone access formulas. Our predicate encryption scheme is constructed via a new approach on bilinear pairings using the notion of dual pairing vector spaces proposed by Okamoto and Takashima.