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It's been known for a long time that any claim in NP has a zero-knowledge proof for it. Has anybody actually implemented a zero-knowledge proof system for a NP-complete language? Using a search engine, the most relevant thing I could find is this:

www.usenix.org/event/sec10/tech/full_papers/Meiklejohn.pdf

I'm not exactly sure what the scope of ZKPDL, but it looks like it's a combination of many special-purpose zero-knowledge protocols, and that it is not intended to NP-complete. It might turn out to be NP-complete with clauses like "x in [0,1]" and "x*y=z" allowing a reduction from SAT to the languages described there. However, the reduction doesn't seem natural or efficient.

The reason I'm asking this is that I'm currently working on an implementation of a NP-complete zero-knowledge protocol and I want to know what the prior work is.

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The answer is yes, check the following paper:

SNARKs for C: Verifying Program Executions Succinctly and in Zero Knowledge Eli Ben-Sasson and Alessandro Chiesa and Daniel Genkin and Eran Tromer and Madars Virza http://eprint.iacr.org/2013/507 (also published at Crypto 2013)

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