2006 | OriginalPaper | Buchkapitel
Non-interactive Zaps and New Techniques for NIZK
verfasst von : Jens Groth, Rafail Ostrovsky, Amit Sahai
Erschienen in: Advances in Cryptology - CRYPTO 2006
Verlag: Springer Berlin Heidelberg
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In 2000, Dwork and Naor proved a very surprising result: that there exist “Zaps”, two-round witness-indistinguishable proofs in the plain model without a common reference string, where the Verifier asks a single question and the Prover sends back a single answer. This left open the following tantalizing question: does there exist a
non-interactive
witness indistinguishable proof, where the Prover sends a single message to the Verifier for some non-trivial NP-language? In 2003, Barak, Ong and Vadhan answered this question affirmatively by derandomizing Dwork and Naor’s construction under a complexity theoretic assumption, namely that Hitting Set Generators against co-nondeterministic circuits exist.
In this paper, we construct non-interactive Zaps for all NP-languages. We accomplish this by introducing new techniques for building Non-Interactive Zero Knowledge (NIZK) Proof and Argument systems, which we believe to be of independent interest, and then modifying these to yield our main result. Our construction is based on the Decisional Linear Assumption, which can be seen as a bilinear group variant of the Decisional Diffie-Hellman Assumption.
Furthermore, our single message witness-indistinguishable proof for Circuit Satisfiability is of size
O
(
k
|
C
|) bits, where
k
is a security parameter, and |
C
| is the size of the circuit. This is much more efficient than previous constructions of 1- or 2-move Zaps.