Cryptology ePrint Archive: Report 2015/273

Dual System Encryption via Predicate Encodings

Hoeteck Wee

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).

Category / Keywords: public-key cryptography /

Original Publication (with minor differences): IACR-TCC-214

Date: received 23 Mar 2015

Contact author: wee at di ens fr

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Version: 20150325:124242 (All versions of this report)

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