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Lattice-Based Inner Product Argument

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Progress in Cryptology - AFRICACRYPT 2022 (AFRICACRYPT 2022)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 13503))

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Abstract

In this paper we put forth the first lattice-based construction of an inner product argument. The inner product argument can serve as a key building block for reducing computation and communication in the arithmetic circuit satisfiability. The only existing inner product arguments are based on the discrete-log problem which leaves them vulnerable to quantum cryptanalysis. An equivalent idea in the lattice-based setting is interesting to explore, especially in the view of the upcoming quantum computing scenario. The underlying lattice commitment on a vector of \(\ell \) ring elements, is computationally binding and hiding assuming hardness of M-LWE and M-SIS problems. The crux idea is to split the vector into s chunks each having \(\ell /s\) ring elements. In contrast to the existing inner product arguments, our commitment includes randomness which guarantees the hiding property of the commitment. The proposed lattice-based inner product argument requires logarithmic communication in the length of the witness for both the prover and the verifier except to a relaxation factor \(\ell ^3\) of the extracted witness. Moreover, we present an optimized inner product argument in which the size of the initial commitment can be further reduced using the properties of ring isomorphism and splitting rings. The idea is to split each witness into chunks, laying them into separate rings that are isomorphic to the ring \(\mathcal {R}_q\), commit to these ring elements and prove the security of the scheme by its reduction to the security of the underlying commitment scheme.

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Author information

Authors and Affiliations

  1. The University of Queensland, Brisbane, Australia

    Veronika Kuchta

  2. University of Luxembourg, Esch-sur-Alzette, Luxembourg

    Rajeev Anand Sahu

  3. Université libre de Bruxelles, Bruxelles, Belgium

    Gaurav Sharma

Authors
  1. Veronika Kuchta
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  2. Rajeev Anand Sahu
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  3. Gaurav Sharma
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Correspondence to Veronika Kuchta .

Editor information

Editors and Affiliations

  1. Radboud University, Nijmegen, The Netherlands

    Lejla Batina

  2. Radboud University, Nijmegen, Gelderland, The Netherlands

    Joan Daemen

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Kuchta, V., Sahu, R.A., Sharma, G. (2022). Lattice-Based Inner Product Argument. In: Batina, L., Daemen, J. (eds) Progress in Cryptology - AFRICACRYPT 2022. AFRICACRYPT 2022. Lecture Notes in Computer Science, vol 13503. Springer, Cham. https://doi.org/10.1007/978-3-031-17433-9_11

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  • DOI: https://doi.org/10.1007/978-3-031-17433-9_11

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  • Online ISBN: 978-3-031-17433-9

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