Welcome to the resource topic for 2022/264
Title:
Gradecast in Synchrony and Reliable Broadcast in Asynchrony with Optimal Resilience, Efficiency, and Unconditional Security
Authors: Ittai Abraham and Gilad Asharov
Abstract:We revisit Gradecast (Feldman and Micali, STOC’88) in Synchrony and Reliable Broadcast (Bracha, Information and Computation’87) in Asynchrony. For both tasks ,we provide new protocols that have three desirable properties: (1) \emph{optimal resilience}, tolerating t<n/3 malicious parties; (2) are \emph{communication-efficient}, where honest parties send just O(n L) bits for a sender with a message of L = \Omega(n \log n) bits; (3) and are \emph{unconditionally secure}, without needing to rely on any computational or setup assumptions (while having a statistical error probability). To the best of our knowledge, no previous work obtains all three properties simultaneously.
ePrint: https://eprint.iacr.org/2022/264
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