Welcome to the resource topic for 2017/1069
Title:
Non-Malleability vs. CCA-Security: The Case of Commitments
Authors: Brandon Broadnax, Valerie Fetzer, Jörn Müller-Quade, Andy Rupp
Abstract:In this work, we settle the relations among a variety of security notions related to non-malleability and CCA-security that have been proposed for commitment schemes in the literature. Interestingly, all our separations follow from two generic transformations. Given two appropriate security notions X and Y from the class of security notions we compare, these transformations take a commitment scheme that fulfills notion X and output a commitment scheme that still fulfills notion X but not notion Y. Using these transformations, we are able to show that some of the known relations for public-key encryption do not carry over to commitments. In particular, we show that, surprisingly, parallel non-malleability and parallel CCA-security are not equivalent for commitment schemes. This stands in contrast to the situation for public-key encryption where these two notions are equivalent as shown by Bellare et al. at CRYPTO ‘99.
ePrint: https://eprint.iacr.org/2017/1069
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