Maya-Pyramid: A Scalable and Self-Organizing Unstructured P2P Overlay
WI-IATW '07 Proceedings of the 2007 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology - Workshops
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PPAM'09 Proceedings of the 8th international conference on Parallel processing and applied mathematics: Part I
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P2P soft security: On evolutionary dynamics of P2P incentive mechanism
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UIC'11 Proceedings of the 8th international conference on Ubiquitous intelligence and computing
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Cooperating with free riders in unstructured P2P networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Securing P2P systems from Sybil attacks through adaptive identity management
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Evaluating stranger policies in P2P file-sharing systems with reciprocity mechanisms
Computer Networks: The International Journal of Computer and Telecommunications Networking
Solving soft security problem in MANETs using an evolutionary approach
SIIS'11 Proceedings of the 2011 international conference on Security and Intelligent Information Systems
Identity management based on adaptive puzzles to protect P2P systems from Sybil attacks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Agents and peer-to-peer computing: towards p2p-based resource allocation in competitive environments
AP2PC'08 Proceedings of the 7th international conference on Agents and Peer-to-Peer Computing
The Peer's Dilemma: A general framework to examine cooperation in pure peer-to-peer systems
Computer Networks: The International Journal of Computer and Telecommunications Networking
Sophia: A local trust system to secure key-based routing in non-deterministic DHTs
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Analysing the development of cooperation in MANETs using evolutionary game theory
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On incentivizing upload capacity in P2P-VoD systems: Design, analysis and evaluation
Computer Networks: The International Journal of Computer and Telecommunications Networking
Resilience and opportunistic forwarding: beyond average value analysis
Proceedings of the 8th ACM MobiCom workshop on Challenged networks
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We devise a model to study the phenomenon of free-riding and free-identities in peer-to-peer systems. At the heart of our model is a user of a certain type, an intrinsic and private parameter that reflects the user's willingness to contribute resources to the system. A user decides whether to contribute or free-ride based on how the current contribution cost in the system compares to her type. We study the impact of mechanisms that exclude low type users or, more realistically, penalize free-riders with degraded service. We also consider dynamic scenarios with arrivals and departures of users, and with whitewashers -users who leave the system and rejoin with new identities to avoid reputational penalties. We find that imposing penalty on all users that join the system is effective under many scenarios. In particular, system performance degrades significantly only when the turnover rate among users is high. Finally, we show that the optimal exclusion or penalty level differs significantly from the level that optimizes the performance of contributors only for a limited range of societal generosity levels.