Extracting Witnesses from Proofs of Knowledge in the Random Oracle Model

Jens Groth

Abstract


We prove that a 3-move interactive proof system with the special soundness property made non-interactive by applying the Fiat-Shamir heuristic is almost a non-interactive proof of knowledge in the random oracle model. In an application of the result we demonstrate that the Damgård-Jurik voting scheme based on homomorphic threshold encryption is secure against a nonadaptive adversary according to Canetti's definition of multi-party computation security.

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DOI: http://dx.doi.org/10.7146/brics.v8i52.21713
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ISSN: 0909-0878 

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