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We consider a simple model for reputation systems such as the one used by eBay. In the model there are n players, some of which may exhibit arbitrarily malicious (Byzantine) behavior, and there are m objects, some of which are bad. The goal of the honest players is to find a good object. To facilitate collaboration, the system maintains a shared billboard. A basic step of a player consists of consulting...
We study how a server may disseminate a large volume of data to a set of clients in the shortest possible time. Cooperative scenarios where clients are willing to upload data to each other and, under a simple bandwidth model, derive an optimal solution involving communication on a hypercube-like overlay network were first considered. The authors also studied different randomized algorithms, and show...
We propose and evaluate a model for controlling infection patterns defined over rounds or real time in a gossip-based protocol using adaptive fanout. We model three versions of gossip-based protocols: the synchronous protocol, the pseudosynchronous protocol and the asynchronous protocol. Our objective is to ensure that the members of a group receive a desired message within a bounded latency with...
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