P2P systems for sharing content have become very popular over the last few years. However, despite the increasing attention of both the research community and large numbers of users, the actual behavior of these systems over prolonged periods of time is still poorly understood. This paper presents a detailed measurement study over a period of eight months of BitTorrent/Suprnova, a P2P file-shar...

Privacy of users in P2P networks goes far beyond their current usage and is a fundamental requirement to the adoption of P2P protocols for legal usage. In a climate of cold war between these users and anti-piracy groups, more and more users are moving to anonymizing networks in an attempt to hide their identity. However, when not designed to protect users information, a P2P protocol would leak ...

BitTorrent and its derivatives contribute a major portion of Internet traffic due to their simple and scalable operation. However, the lack of security mechanisms makes them vulnerable to attacks such as file piece pollution, connection slot consumption, and bandwidth exhaustion. These effects are made worse by the ability of attackers to manufacture new identities, or Sybil nodes, at will. The...

P2P systems for sharing content have become very popular over the last few years. However, despite the increasing attention of both the research community and large numbers of users, the actual behavior of these systems over prolonged periods of time is still poorly understood. This paper presents a detailed measurement study over a period of eight months of BitTorrent/Suprnova, a P2P file-shar...

In a Peer-to-Peer (P2P) network there is a lack of clear distinction among client and server nodes. Each and every network node (or peer) requires network resources and contributes resources to the network. This arrangement gives a clear representation that when more number of peers enter in to the network, additional resources such as CPU, storage, and bandwidth will be available for all the p...

Free riding, the behavior of attempting to benefit resources contributed by others while sharing their own values as minimum as possible, is one of the key problems in many P2P systems. Incentive mechanisms are proposed to solve the problem. In this paper, we introduce an all-pay auction model to study the resource distribution process in BitTorrent-like P2P system. Based on this model, the adv...

In recent years, BitTorrent has emerged as a very popular and scalable peer-to-peer file distribution mechanism. It has been successful at distributing large files quickly and efficiently without overwhelming the capacity of the origin server. Early measurement studies verified that BitTorrent achieves excellent upload utilization, but raised several questions concerning utilization in settings...

This paper presents an application of the Group-based Service Discovery Protocol (GSD) to implement the BitTorrent file sharing protocol on dynamically variable mobile ad-hoc network (MANET) environments. We used a so called ’trackerless’ extension of the BitTorrent to make our system more efficient on mobile P2P networks. Also we have implemented a discrete event simulator in Java language, to...

Peer-to-peer (p2p) networks are popular for their improved scalability compared to the client/server architecture. Hereby, the contribution of upload capacity provided by each peer to the network is the basic principle. BitTorrent is a very popular p2p application for file-sharing which is optimized for fast file dissemination. Key component is its tit-for-tat strategy to decide to whom a peer ...

Of the many P2P file-sharing prototypes in existence, BitTorrent is one of the few that has managed to attract millions of users. BitTorrent relies on other (global) components for file search, employs a moderator system to ensure the integrity of file data, and uses a bartering technique for downloading in order to prevent users from freeriding. In this paper we present a measurement study of ...