BitTorrent has been popular over the last decade. However, few studies have made serious efforts to understand who and why publish torrents, and what strategies are adopted by publishers. In this paper, we study the current content publishing practice in BitTorrent from a socio-economic point of view, by unraveling (1) how files are published by publishers, (2) what strategies are adopted by pu...

Among all peer-to-peer (P2P) filesharing systems, BitTorrent rises as the most prominent one. A recent analysis [1] shows that although P2P traffic is slightly declining, but BitTorrent traffic is still on the rise. It is responsible for more than 45-78% of all P2P traffic, roughly a quarter of all Internet traffic. This success has drawn a great deal of research interest on the system. In part...

Motivated by the need to deploy a public repository of multi-gigabyte trace files, we studied the BitTorrent protocol’s ability to disseminate very large files among peers. BitTorrent is a popular peer-to-peer protocol that allows parallel downloads of large files. In this paper, we analyzed user activity on BitTorrent over a four-month period with respect to supportable file sizes, file popula...

Collective communication in high-performance computing is traditionally implemented as a sequence of point-to-point communication operations. For example, in MPI a broadcast is often implemented using a linear or binomial tree algorithm. These algorithms are inherently unaware of any underlying network heterogeneity. Integrating topology awareness into the algorithms is the traditional way to a...

This paper presents two kinds of attacks based on crawling the DHTs used for distributed BitTorrent tracking. First, we show how pirates can use crawling to rebuild BitTorrent search engines just a few hours after they are shut down (crawling for fun). Second, we show how content owners can use related techniques to monitor pirates’ behavior in preparation for legal attacks and negate any perce...

For Peer-to-Peer (P2P) file-sharing services cooperation is essential. However, peers behave rationally and try to maximise their benefits, while minimising their effort. To increase system performance incentive schemes are used to enforce cooperation. Nonetheless, so called free-riders and malicious peers try to attack these incentive schemes. In this paper we will first explain two popular P2...

eer-to-Peer(P2P) networks are powerful distributed solutions which do not rely on external servers and gather required resources from their users. Therefor fairness is an important feature for designers of these networks. To have a fair network we always want to prevent free-riding. One of the most important file-sharing protocols in P2P is Bittorrent. What separates Bittorrent from other P2P p...

Large volumes of Internet traffic are nowadays generated by BitTorrent. In this article, we propose the insertion of high-bandwidth ISPowned peers as an optimization approach to improve end-users’ performance and reduce inter-domain traffic. An ISP-owned peer participates in BitTorrent swarms in order to download chunks and subsequently serve regular peers. We have run simulations on the ns-2 p...

In this paper, we present a solution that incorporates BitTorrent mechanism into P2P streaming. In our solution, several modifications have been incorporated into BitTorrent to support on-time delivery. First, we give the pieces different priorities based on their scheduled playback deadline. Second, source behaves in a push-based way instead of pull-based way. Finally, we import a blocklevel t...

This paper proposes the Sensing Data Market (SenseMart). It leverages the existing sensing and communication infrastructure for a low capital investment cost. The goal of SenseMart is to facilitate and provide incentives for the exchange of sensing data among users (as in a marketplace) and can be seen as the "BitTorrent" of sensing data.