Quantum Proofs of Knowledge

Dominique Unruh.
in Eurocrypt 2012, LNCS vol. 7237, Springer, pp. 135-152, April 2012. Preprint on IACR ePrint 2010/212.


We motivate, define and construct quantum proofs of knowledge, proofs of knowledge secure against quantum adversaries. Our constructions are based on a new quantum rewinding technique that allows us to extract witnesses in many classical proofs of knowledge. We give criteria under which a classical proof of knowledge is a quantum proof of knowledge. Combining our results with Watrous' results on quantum zero-knowledge, we show that there are zero-knowledge quantum proofs of knowledge for all languages in NP.

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