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Application-Layer Multicast (ALM) has recently emerged as a promising solution for diverse group-oriented applications. Unlike dedicated routers in IP multicast, the autonomous end-hosts are generally unreliable and even selfish. A strategic host might cheat about its private information to affect protocol execution and, in turn, to improve its individual benefit. Specifically, in a link-weighted ALM protocol where the hosts measure the distances from their neighbors and accordingly construct the ALM topology, a selfish end-host can easily intercept the measurement message and exaggerate the distances to other nodes, so as to reduce the probability of being a relay.
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