We present new constructions of two-message and one-message witness-indistinguishable proofs (ZAPs and NIWIs). This includes:
\begin{itemize}
\item
ZAP (or, equivalently, non-interactive zero-knowledge in the common random string model) from indistinguishability obfuscation and one-way functions.
\item
NIWIs from indistinguishability obfuscation and one-way permutations.
\end{itemize}
The previous construction of ZAPs [Dwork and Naor, FOCS 00] was based on trapdoor permutations. The two previous NIWI constructions were based either on ZAPs and a derandomization-type complexity assumption [Barak, Ong, and Vadhan CRYPTO 03], or on a specific number theoretic assumption in bilinear groups [Groth, Sahai, and Ostrovsky, CRYPTO 06].
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