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Title:
Flaws in a Verifiably Multiplicative Secret Sharing Scheme from ICITS 2017
Authors: Maki Yoshida, Satoshi Obana
Abstract:In this paper, we point out flaws in an existing verifiably multiplicative secret sharing (VMSS) scheme. Namely, we show that a scheme proposed by Yoshida and Obana presented at ICITS 2017 is insecure against an adversary who corrupts a single player. We then show that in the model of ICITS 2017 which restricts the decoder additive, the error-free verification is impossible. We further show that by allowing a general class of decoders which include a linear one, the scheme is error-free.
ePrint: https://eprint.iacr.org/2018/083
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