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International Conference on Applied Cryptography and Network Security

ACNS 2018: Applied Cryptography and Network Security pp 44–62Cite as

Non-interactive Zaps of Knowledge

Part of the Lecture Notes in Computer Science book series (LNSC,volume 10892)

Abstract

While non-interactive zero-knowledge (NIZK) proofs require trusted parameters, Groth, Ostrovsky and Sahai constructed non-interactive witness-indistinguishable (NIWI) proofs without any setup; they called their scheme a non-interactive zap. More recently, Bellare, Fuchsbauer and Scafuro investigated the security of NIZK in the face of parameter subversion and observe that NI zaps provide subversion-resistant soundness and WI.

Arguments of knowledge prove that not only the statement is true, but also that the prover knows a witness for it, which is essential for anonymous identification. We present the first NIWI argument of knowledge without parameters, i.e., a NI zap of knowledge. Consequently, our scheme is also the first subversion-resistant knowledge-sound proof system, a notion recently proposed by Fuchsbauer.

Keywords

  • Non-interactive proofs
  • Argument of knowledge
  • Subversion resistance

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Acknowledgements

The authors would like to thank the anonymous reviewers of PKC 2018 and ACNS 2018 for their helpful comments. The first author is supported by the French ANR EfTrEC project (ANR-16-CE39-0002). The second author is supported by ERC grant 639554 (project aSCEND).

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Authors and Affiliations

  1. Inria, Paris, France

    Georg Fuchsbauer & Michele Orrù

  2. École normale supérieure, CNRS, PSL University, Paris, France

    Georg Fuchsbauer & Michele Orrù

Authors
  1. Georg Fuchsbauer
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  2. Michele Orrù
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Correspondence to Georg Fuchsbauer or Michele Orrù .

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Editors and Affiliations

  1. imec-COSIC, KU Leuven, Heverlee, Belgium

    Bart Preneel

  2. imec-COSIC, KU Leuven, Heverlee, Belgium

    Frederik Vercauteren

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Fuchsbauer, G., Orrù, M. (2018). Non-interactive Zaps of Knowledge. In: Preneel, B., Vercauteren, F. (eds) Applied Cryptography and Network Security. ACNS 2018. Lecture Notes in Computer Science(), vol 10892. Springer, Cham. https://doi.org/10.1007/978-3-319-93387-0_3

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  • DOI: https://doi.org/10.1007/978-3-319-93387-0_3

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