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Title:
Rational Broadcast Protocols against Timid Adversaries
Authors: Keigo Yamashita, Kenji Yasunaga
Abstract:We present a constant-round deterministic broadcast protocol against timid adversaries in the synchronous authenticated setting. A timid adversary is a game-theoretically rational adversary who tries to attack the protocol but prefers the actions to be undetected. Our protocol is secure against such an adversary corrupting t out of n parties for any t < n. The round complexity is 5 for timid adversaries and is at most t + 5 for general malicious adversaries. Our results demonstrate that game-theoretic rationality enables us to circumvent the impossibility of constructing constant-round deterministic broadcast protocols for t = ω(1).
ePrint: https://eprint.iacr.org/2023/1479
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