An efficient compiler from Σ-protocol to 2-move deniable zero-knowledge

  • Authors:
  • Jun Furukawa;Kaoru Kurosawa;Hideki Imai

  • Affiliations:
  • NEC Corporation, Japan;Ibaraki University, Japan;Research Center for Information Security, National Institute of Advanced Industrial Science and Technology, Japan

  • Venue:
  • ICALP'06 Proceedings of the 33rd international conference on Automata, Languages and Programming - Volume Part II
  • Year:
  • 2006

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Abstract

Pass showed a 2-move deniable zero-knowledge argument scheme for any ${\cal NP}$ language in the random oracle model at Crypto 2003. However, this scheme is very inefficient because it relies on the cut and choose paradigm (via straight-line witness extractable technique). In this paper, we propose a very efficient compiler that transforms any Σ-protocol to a 2-move deniable zero-knowledge argument scheme in the random oracle model, which is also a resettable zero-knowledge and resettably-sound argument of knowledge. Since there is no essential loss of efficiency in our transform, we can obtain a very efficient undeniable signature scheme and a very efficient deniable authentication scheme