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.
Category / Keywords: non-malleability, CCA security, commitments, security definitions Original Publication (in the same form): IACR-PKC-2018 Date: received 3 Nov 2017, last revised 9 Jan 2018 Contact author: brandon broadnax at kit edu Available format(s): PDF | BibTeX Citation Version: 20180109:095509 (All versions of this report) Short URL: ia.cr/2017/1069