On the Price of Proactivizing Round-Optimal Perfectly Secret Message Transmission.

In a network of n nodes (modeled as a digraph), the goal of a perfectly secret message transmission (PSMT) protocol is to replicate sender's message m at the receiver's end without revealing any information about m to a computationally unbounded adversary that eavesdrops on any t nodes. The adversary may be mobile too that is, it may eavesdrop on a different set of t nodes in different rounds. We ...