*15:17*[Pub][ePrint] Improved Dual System ABE in Prime-Order Groups via Predicate Encodings, by Jie Chen and Romain Gay and Hoeteck Wee

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).