Finding δ-Closure Property of BitTorrent System and Applications Based on This Property

Abstract

In the Peer-to-peer (P2P) field, a basic problem is to build a model which can exactly represent the behaviors of peers. According to the protocols of BitTorrent (BT) system, participating peers are selected randomly when downloading some content. However, by using the connection model gathered during a one-month period, we found that the BT peers are subject to the δ-closure property, which is that the content in one δ-closure tends to spread inside this δ-closure. In this paper, we defined δ-closureaccording to the complex network theory. Then we tried to design algorithm to attain δ-closure. By gathered dataset, we verified the existing of δ-closure in BT system. Finally, we proposed possible applications based on this property. © Springer-Verlag Berlin Heidelberg 2013.