2009 | OriginalPaper | Buchkapitel
Statistically Hiding Sets
verfasst von : Manoj Prabhakaran, Rui Xue
Erschienen in: Topics in Cryptology – CT-RSA 2009
Verlag: Springer Berlin Heidelberg
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Zero-knowledge set is a primitive introduced by Micali, Rabin, and Kilian (FOCS 2003) which enables a prover to commit a set to a verifier, without revealing even the size of the set. Later the prover can give zero-knowledge proofs to convince the verifier of membership/non-membership of elements in/not in the committed set. We present a new primitive called
Statistically Hiding Sets
(SHS), similar to zero-knowledge sets, but providing an information theoretic hiding guarantee, rather than one based on efficient simulation. Then we present a new scheme for statistically hiding sets, which does not fit into the “Merkle-tree/mercurial-commitment” paradigm that has been used for
all
zero-knowledge set constructions so far. This not only provides efficiency gains compared to the best schemes in that paradigm, but also lets us provide
statistical
hiding; previous approaches required the prover to maintain growing amounts of state with each new proof for such a statistical security.
Our construction is based on an algebraic tool called
trapdoor DDH groups
(TDG), introduced recently by Dent and Galbraith (ANTS 2006). However the specific hardness assumptions we associate with TDG are different, and of a strong nature — strong RSA and a knowledge-of-exponent assumption. Our new knowledge-of-exponent assumption may be of independent interest. We prove this assumption in the generic group model.