摘要： 对等网络提供了一种开放的、自由进行文件交换的环境，但随着网络的飞速发展，恶意文件泛滥，搭便车现象严重，使得系统的稳定性和可用性受到了威胁。信任机制的建立将有助于解决这些问题。该文在分析了一种信任模型SELCUK的特点和不足基础上，提出了一种改进的信任模型SELCUK-I，通过对等网络协同工具应用表明，SELCUK-I信任模型具有更好的安全性和可用性。

关键词: 信任, 信任模型, 对等网, 文件共享

Abstract: The peer-to-peer networks provides an open and autonomic environment for file sharing. While with the rapid development of peer-to-peer networks, some bad phenomena such as malicious contents flooding and a large number of free-riders, threaten its stability and availability. A good trust model is helpful to settle such problems. Based on analyzing a trust model——SELCUK, this paper proposes an improvement trust model—— SELCUK-I. It is more security and availability than the SELCUK trust model by peer-to-peer cooperated tools application.

Key words: Trust, Trust model, Peer-to-peer networks, File sharing