Computational soundness of non-malleable commitments

  • Authors:
  • David Galindo;Flavio D. Garcia;Peter Van Rossum

  • Affiliations:
  • Departament of Computer Science, University of Malaga, Spain;Institute for Computing and Information Sciences, Radboud University Nijmegen, The Netherlands;Institute for Computing and Information Sciences, Radboud University Nijmegen, The Netherlands

  • Venue:
  • ISPEC'08 Proceedings of the 4th international conference on Information security practice and experience
  • Year:
  • 2008

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Abstract

This paper aims to find a proper security notion for commitment schemes to give a sound computational interpretation of symbolic commitments. We introduce an indistinguishability based security definition of commitment schemes that is equivalent to non-malleability with respect to commitment. Then, we give a construction using tag-based encryption and one-time signatures that is provably secure assuming the existence of trapdoor permutations. Finally, we apply this new machinery to give a sound interpretation of symbolic commitments in the Dolev-Yao model while considering active adversaries.