International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 25 March 2015

Hoeteck Wee
ePrint Report ePrint Report
We introduce the notion of predicate encodings, an information-theoretic primitive reminiscent of linear secret-sharing that in addition, satisfies a novel notion of reusability. Using this notion, we obtain a unifying framework for adaptively-secure public-index predicate encryption schemes for a large class of predicates. Our framework relies on Waters\' dual system encryption methodology (Crypto \'09), and encompass the identity-based encryption scheme of Lewko and Waters (TCC \'10), and the attribute-based encryption scheme of Lewko et al. (Eurocrypt \'10). In addition, we obtain several concrete improvements over prior works. Our work offers a novel interpretation of dual system encryption as a methodology for amplifying a one-time private-key primitive (i.e. predicate encodings) into a many-time public-key primitive (i.e. predicate encryption).

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