摘要：

针对P2P系统中的白洗问题，提出一种新的激励机制，采用博弈理论分析方法，揭示传统Tit-for-Tat策略在具有白洗用户的P2P系统中进化的不稳定性，指出引入恰当的身份费用改进Tit-for-Tat策略是种遏制白洗攻击的有效方法。仿真实验结果表明，该机制能够有效提升系统整体性能。

关键词: _白洗, 激励, 进化稳定策略

Abstract: Aiming at the problem of whitewashing in Peer-to-Peer(P2P) system, a novel incent mechanism is pro¬posed. Using game theoretic analysis, this paper reveals that the conventional Tit-for-Tat(TfT) is not an evolutionary stable strategy in P2P systems with some whitewashers. It also indicates that an improved strategy to integrate an appropriate identity cost into TfT is an effective method to impress whitewashers. Simulation experimental results show this mechanism promotes the performance of the whole system effectively.

Key words: whitewashing, incent, evolutionary stable strategy

中图分类号: 

• TP393