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Title:
Interplay between (Im)perfectness, Synchrony and Connectivity: The Case of Reliable Message Transmission
Authors: Abhinav Mehta, Shashank Agrawal, Kannan Srinathan
Abstract:For unconditionally reliable message transmission (URMT) in synchronous directed networks of n nodes, a subset of which may be Byzantine faulty, it is well-known that the minimum connectivity requirements for zero-error (perfect) protocols to exist is strictly higher than those where a negligible yet non-zero error probability is allowed (Monte Carlo protocols). In this work, we study the minimum connectivity requirements for the existence of (a) synchronous Las Vegas protocols, (b) asynchronous Monte Carlo protocols, and (c) asynchronous Las Vegas protocols for URMT. Interestingly, we prove that in any network, synchronous Las Vegas URMT protocol exists if and only if asynchronous Monte Carlo URMT protocol exists too. We further show that asynchronous Las Vegas URMT protocols exist if and only if synchronous perfect protocols exist. We conclude with another interesting result: there exists networks where the number of critical edges for the ‘easier’ randomized variants are asymptotically higher than that for the perfect variant. Thus, our results establish an interesting interplay between (im)perfectness, synchrony and connectivity for the case of URMT.
ePrint: https://eprint.iacr.org/2010/392
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