Existing p2p file sharing networks doesn’t always give their users abilities to make an effective and fast searches for particular data. In this paper we introduce some improvements for main subset of these networks, especially for bittorrent and descript some well known methods of search query routing, used in other networks that may be useful for our purposes too. We describe some ideas of mo...

The wide spread of Peer-to-Peer networks makes multimedia files available to users all around the world. However, Peer-to-Peer networks are often used to spread illegal material, while keeping the source of the data and the acquiring users anonymous. In this paper we analyze activity measurements in the BitTorrent network and examine child sex abuse activity through three major BitTorrent web p...

For many applications that require the distribution of files to a very large number of users, peer-to-peer (P2P) file-sharing networks are an attractive alternative to server-based solutions. If the community of file-sharers cooperates appropriately, very high download rates can be achieved at virtually no cost to the injector of the content. We begin this chapter with a brief history of P2P fi...

Fake content represents an important portion of those files shared in BitTorrent. In this paper we conduct a large scale measurement study in order to analyse the fake content publishing phenomenon in the BitTorrent Ecosystem. Our results reveal that a few tens of users are responsible for 90% of the fake content. Furthermore, more than 99% of the analysed fake files are linked to either malwar...

Popular content such as software updates is requested by a large number of users. Traditionally, to satisfy a large number of requests, lager server farms or mirroring are used, both of which are expensive. An inexpensive alternative are peer-to-peer based replication systems, where users who retrieve the file, act simultaneously as clients and servers. In this paper, we study BitTorrent, a new...

While BitTorrent has been successfully used in peerto-peer content distribution, its performance is limited by the fact that typical internet users have much lower upload bandwidths than download bandwidths. This asymmetry in bandwidth results in the overall average download speed of a BitTorrent-like file download system to be bottle-necked by the much lower upload capacity. This motivates our...

BitTorrent is a peer-to-peer computer network protocol for sharing content in an efficient and scalable way. Modeling and analysis of the popular private BitTorrent communities has become an active area of research. In these communities users are strongly incentivized to contribute their resources, i.e., to share their files. In BitTorrent terminology, users who have finished downloading files ...

We show that, contrary to common belief, free riding is indeed possible in BitTorrent. We present a BitTorrent client implementation in Java which successfully downloads shared files without ever contributing a single byte of user data to the network. Surprisingly, this client often achieves the same download speed as the original BitTorrent client. This client is of particular interest for peo...

Though many have explored BitTorrent networks theoretically or experimentally, few have examined the graph topology underlying the connections made between peers in a BitTorrent system. Also, many have looked at the presence of scale-free and small-world characteristics in various peerto-peer network topologies, but not specifically at BitTorrent, the most popular peer-to-peer system. This pape...

The BitTorrent client application is a popular utility for sharing large files over the Internet. Sometimes, this powerful utility is used to commit cybercrimes, like sharing of illegal material or illegal sharing of legal material. In order to help forensics investigators to fight against these cybercrimes, we carried out an investigation of the artifacts left by the BitTorrent client. We prop...