Mapper:一种基于组播的Peer-to-Peer文件匿名访问协议

Mapper:A Multicast-Based Peer-to-Peer File Anonymous Retrieval Protocol

Peer to Peer(P2P)文件系统的一个基本问题是如何在保护节点隐私的基础上为数据访问提供高效服务 .Mapper将IP组播技术和多级代理转发技术相结合 ,解决了P2P文件访问的相互匿名问题 .协议还通过MRFC算法将组成员筛选和缓存位置选择有机统一 ,在减少组播开销的同时保证了文件布局对用户访问模式的动态自适应性 .实验表明 ,Mapper能有效缓解网络负载 ,提高数据的易获取性 ,具有良好的伸缩性和自适应性 .

A fundamental problem of Peer-to-Peer file sharing system is how to protect the privacy and anonymity of nodes while providing efficient data access service. We presented a Multicast-based Peer-to-Peer file anonymous retrieval protocol called Mapper. By the combination of IP multicast technology and Multi-proxy forwarding technology, Mapper satisfies the requirements of mutual anonymity during the file access process. The protocol also integrates group member selection with cache position selection via MRFC (Most Requested Frequency Caching) algorithm, thus file distribution can be adjusted adaptively with respect to dynamic usage patterns and multicast overhead can be controlled. The experimental results show that Mapper can alleviate network traffic, reduce access delay efficiently, and has the merits of scalability, reliability and adaptability.