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ISTC-CC Abstract
DCast: Sustaining Collaboration in Overlay Multicast
despite Rational Collusion
(CCS'12), October 2012.
Haifeng Yu,
National University of Singapore,
Republic of Singapore
Phillip B. Gibbons,
Intel Labs
Chenwei Shi,
Mozat Pte Ltd,
Republic of Singapore
A key challenge in large-scale collaborative distributed systems is to properly incentivize the rational/selfish users so that they will properly collaborate. Within such a context, this paper focuses on designing incentive mechanisms for overlay multicast systems. A key limitation shared by existing proposals on the problem is that they are no longer able to provide proper incentives and thus will collapse when rational users collude or launch sybil attacks.
This work explicitly aims to properly sustain collaboration despite collusion and sybil attacks by rational users. To this end, we propose a new decentralized DCast multicast protocol that uses a novel mechanism with debt-links and circulating debts. We formally prove that the protocol offers a novel concept of safety-net guarantee: A user running the protocol will always obtain a reasonably good utility despite the deviation of any number of rational users that potentially collude or launch sybil attacks. Our prototyping as well as simulation demonstrates the feasibility and safety-net guarantee of our design in practice.
KEYWORDS:
Algorithmic mechanism design, incentive mechanism, rational collusion,
sybil attack, whitewashing attack, overlay multicast
FULL PAPER: pdf
