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Erschienen in:
2015 | OriginalPaper | Buchkapitel
Improved Dual System ABE in Prime-Order Groups via Predicate Encodings
verfasst von : Jie Chen, Romain Gay, Hoeteck Wee
Erschienen in: Advances in Cryptology - EUROCRYPT 2015
Verlag: Springer Berlin Heidelberg
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We present a modular framework for the design of efficient adaptively secure attribute-based encryption (ABE) schemes for a large class of predicates under the standard
$$k$$
-Lin assumption in prime-order groups; this is the first uniform treatment of dual system ABE across different predicates and across both composite and prime-order groups. Via this framework, we obtain concrete efficiency improvements for several ABE schemes. Our framework has three novel components over prior works: (i) new techniques for simulating composite-order groups in prime-order ones, (ii) a refinement of prior encodings framework for dual system ABE in composite-order groups, (iii) an extension to weakly attribute-hiding predicate encryption (which includes anonymous identity-based encryption as a special case).