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Published in:
2008 | OriginalPaper | Chapter
Computational Soundness of Non-Malleable Commitments
Authors : David Galindo, Flavio D. Garcia, Peter van Rossum
Published in: Information Security Practice and Experience
Publisher: Springer Berlin Heidelberg
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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.