According to Huijia Lin and Rafael Pass's "Concurrent Non-Malleable Zero Knowledge with Adaptive Inputs" paper:
if collision-resistant hash functions exist, then
"there exists a $\omega\left(\log^2(k)\right)$-round concurrent non-malleable zero-knowledge proof with adaptive input selection (and a with a black-box simulator) for all of NP",
where the "adaptive input selection" is in the strongest strongest sense that I know of.
As far as I can tell, their assumptions can be reduced to 2-round statistically hiding commitment with publicly verifiable opening. However, after searching online, I do not see any results for concurrent non-malleable statistical zero knowledge.
Is there any known construction for
concurrent non-malleable statistical zero-knowledge arguments of knowledge
(in the plain model)?
