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DHT网络基于债务关系的公平文件交换
?DHT 网络基于债务关系的公平文件交换坤 1,2+,吴国新 1, 许立波 1, 陈刚 1于1(计算机网络和信息集成教育部重点实验室(东南大学),江苏 南京 210096)2(淮阴工学院 计算机系,江苏 淮阴 223001)Debt Relationship Based Fair File Exchange in Distributed Hash Table NetworkYU Kun1,2+, WU Guo-Xin1, XU Li-Bo1, CHEN Gang11(Key Laboratory of Computer Network and Information Integration (Southeast University) Ministry of Education, Nanjing 210096, China)2(Department of Computer Science, Huaiyin Institute of Technology, Huaiyin 223001, China)+ Corresponding author: Phn: +86-25 E-mail: mailto:varguard@varguard@Yu K, Wu GX, Xu LB, Chen G. Debt relationship based fair file exchange in distributed hash table network.Journal of Software, 2007,18(7):1778?1785. /1000-9825/18/1778.htm/1000-9825/18/1778.htmAbstract: The selfishness of nodes degrades the system usability of P2P network. Debt relationship based fileexchange network constructs an incentive mechanism which induces cooperation and guarantees fairness in file exchange. The key point of the mechanism is finite neighbors, an inherent characteristic in DHT (distributed hash table) networks and so is the interacting between nodes form a repeated games. DFFE (debt relationship based fair file exchange in DHT network) protocol only needs to maintain a little local interacting information, so the protocol cost is low and scalable for large network. In routing, one-hop information based greedy arithmetic is used. Game among rational nodes exists a Nash equilibrium and the approximate algorithm of strategy selection gradually converges. Simulations indicate the validity of incentive mechanism and the steady performance in dynamic networks.Key words: P2P (peer to peer); DHT (distributed hash table); incentive mechanism; Nash equilibrium摘 要: P2P(peer to peer)网络中,节点的自私行为极大地降低了系统的可用性.基于债务关系的文件交换网络,构建了一种促进合作的激励机制.同时,该机制保证了文件交换的公平性.激励机制的关键在于 DHT(distributed hash table) 网络邻居有限的固有特征, 因而节点间的交互易于形成重复博弈.DFFE(debt relationship based fair file exchange in DHT network)
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