Abstract. 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). ⋆ wee@di.ens.fr. CNRS (UMR 8548) and INRIA.
Recently, Wee REF proposed an information-theoretic primitive called predicate encodings that characterize the underlying algebraic structure of a number of predicate encoding schemes, including known IBE [21] and attribute-based encryption (ABE) [20] schemes.
Dual System Encryption via Predicate Encodings
TCC
Computer Science