Resettable Zero Knowledge with Concurrent Soundness in the Bare Public-Key Model under Standard Assumption

  • Authors:
  • Yi Deng;Dongdai Lin

  • Affiliations:
  • The state key laboratory of information security, Institute of software, Chinese Academy of sciences, Beijing, China 100080 and Graduate School of Chinese Academy of Sciences,;The state key laboratory of information security, Institute of software, Chinese Academy of sciences, Beijing, China 100080

  • Venue:
  • Information Security and Cryptology
  • Year:
  • 2007

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Abstract

In this paper we present the firstconstant round resettable zero knowledge arguments with concurrent soundness for $\mathcal{NP}$ in the bare public-key (BPK for short) model assuming only collision-resistant hash functions against polynomial-timeadversaries. This resolves the problem whether there exist such protocols for $\mathcal{NP}$ in BPK model without assuming sub-exponential hardness. In our protocol, the resettable zero knowledge is demonstrated via a black-box simulator, while the concurrent soundness is proved by using the malicious prover strategy in non-black-boxmanner.