• Title/Summary/Keyword: BitTorrent

Search Result 17, Processing Time 0.024 seconds

Methodology for digital investigation of illegal sharing using BitTorrent (BitTorrent를 이용한 저작물 불법 공유 조사 방법에 관한 연구)

  • Park, Soo-Young;Chung, Hyun-Ji;Lee, Sang-Jin
    • Journal of the Korea Institute of Information Security & Cryptology
    • /
    • v.23 no.2
    • /
    • pp.193-201
    • /
    • 2013
  • Sharing copyrighted files without copyright holder's permission is illegal. But, a number of illegal file sharers using BitTorrent increase. However, it is difficult to find appropriate digital evidences and legal basis to punish them. And, there are no framework for digital investigation of illegal sharing using BitTorrent. Additionally, role of server in BitTorrent had been reduced than server in conventional P2P. So, It is difficult to apply investigation framework for illegal sharing using conventional P2P to investigation process of illegal sharing using BitTorrent. This paper proposes the methodology about punishing illegal sharer using BitTorrent by suggesting the digital investigation framework.

An Analysis on BitTorrent Performance Based on the Number of Unchoked Peers (Unchoked Peer 개수에 따른 BitTorrent 성능 분석)

  • Chung, Tae-Joong;Han, Jin-Young;Kim, Hyun-Chul;Kwon, Tae-Kyoung;Choi, Yang-Hee
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.35 no.8B
    • /
    • pp.1197-1203
    • /
    • 2010
  • A strength of BitTorrent, which is widely used for file sharing today, is due to its peer selection mechanism which is designed to encourage peers to contribute data. In the peer selection phase in BitTorrent, peers to upload the file in a swarm are selected by determining which peers upload the most to themselves. However, the number of peers to upload (i.e., number of unchoked peers) is fixed to four in its peer selection mechanism of BitTorrent, which yields inefficiency because the situation of the swarm may vary frequently (e.g., number of peers in the swarm, download rates, and upload rates). In this paper, we analyze the swarming system performance when the number of unchoked in BitTorrents is not static, but dynamic. For empirical investigation, we established a testbed in Seoul National University by modifying an open-source BitTorrent client, which is popular. Through our experiments, we show that an adaptive mechanism to adjust the number of unchoked peers considering the situation of the swarm is needed to improve the performance of BitTorrent.

A Study on Pieces Selection Technique in BitTorrent (BitTorrent에서 Pieces Selection 기법에 대한 연구)

  • Kim, Dong-Jin;Yoon, Ji-Yean;Moon, Il-Young
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2012.05a
    • /
    • pp.286-288
    • /
    • 2012
  • 파일 공유를 위해 널리 사용되는 BitTorrent는 대표적인 P2P 프로토콜이다. BitTorrent는 전송을 요구한 클라이언트가 작은 단위로 쪼개진 하나의 파일을 다수의 클라이언트들로부터 받는 방식으로 기존의 일대일 P2P 전송방식에 대비하여 빠른 다운로드 속도를 낼 수 있다. 이러한 다운로드 성능을 발휘하기위해 다수의 조각으로 분리 된 파일 조각을 선택하는 Pieces Selection 기법은 매우 중요하다. 이에 본 논문에서는 BitTorrent에서 활용되는 네 가지의 Pieces Selection 기법에 대해 알아보고, 성능 개선을 위한 새로운 기법을 제안한다.

  • PDF

Selective HAVE Message Exchange for the Improvement of Live Streaming Performance in BitTorrent-based Mesh-Pull Structure (BitTorrent 기반의 Mesh-Pull 구조에서 라이브 스트리밍 성능 개선을 위한 선택적인 HAVE 메시지 전송 방법)

  • Han, Ho-Dol;Kim, Seongmin;Roh, Byeong-hee
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • 2013.11a
    • /
    • pp.310-313
    • /
    • 2013
  • BitTorrent는 파일 공유를 위하여 가장 널리 사용되고 있는 P2P (Peer to Peer)프로토콜로서, Mesh-Pull 구조를 채용하여 라이브 스트리밍에 대한 연구가 꾸준히 이루어지고 있다. BitTorrent에서는 Peer Wire Protocol을 사용하여 피어들간에 파일조각들을 교환하게 되는데, 이를 위하여 주기적으로 버퍼맵 정보를 HAVE 메시지를 사용하여 브로드캐스트 하는데, 피어의 수가 증가할수록 이로 인한 시그널링 오버헤드가 크게 증가하는 문제를 갖고 있다. 본 논문에서는 이러한 문제를 극복하고 라이브 스트리밍의 성능을 개선하기 위하여 HAVE 메시지를 선택적으로 전송하는 방법을 제안한다. 실험을 통하여, 제안 방식은 기존의 BitTorrent 기반 Mesh-Pull 구조를 채용하는 라이브 스트리밍 방식과 비교하여 HAVE 메시지의 브로드캐스트로 인한 시그널링 오버헤드를 비약적으로 줄일 수 있음을 보였다.

Support Vector Machines-based classification of video file fragments (서포트 벡터 머신 기반 비디오 조각파일 분류)

  • Kang, Hyun-Suk;Lee, Young-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.16 no.1
    • /
    • pp.652-657
    • /
    • 2015
  • BitTorrent is an innovative protocol related to file-sharing and file-transferring, which allows users to receive pieces of files from multiple sharer on the Internet to make the pieces into complete files. In reality, however, free distribution of illegal or copyright related video data is counted for crime. Difficulty of regulation on the copyright of data on BitTorrent is caused by the fact that data is transferred with the pieces of files instead of the complete file formats. Therefore, the classification process of file formats of the digital contents should take precedence in order to restore digital contents from the pieces of files received from BitTorrent, and to check the violation of copyright. This study has suggested SVM classifier for the classification of digital files, which has the feature vector of histogram differential on the pieces of files. The suggested classifier has evaluated the performance with the division factor by applying the classifier to three different formats of video files.

A Method of Test Coverage Measurement Based on BitTorrent for Internet of Things Environment (사물 인터넷 환경을 위한 BitTorrent 알고리즘 기반의 테스트 커버리지 측정기법)

  • Ryu, Hodong;Lee, Woo Jin
    • KIPS Transactions on Computer and Communication Systems
    • /
    • v.3 no.10
    • /
    • pp.365-370
    • /
    • 2014
  • Although Internet of Things already became a new paradigm on service on network, we should pay more effort for studying about its testing method, since humans, things and environments in IoT are connected to each other without any restrictions. Earlier researches based on emulators showed that such virtual devices on emulators had unavoidable gap between them and real things. Furthermore, growth of connection complexity between the devices and loosing of restrictions make the gap wider. Accordingly, in this paper, we suppose a method of test coverage measurement based on BitTorrent for IoT environment. It has cooperation features among homogeneous devices with avoiding the overlapping on each part of whole test process.

Connectivity properties of real BitTorrent swarms

  • Ruben, Cuevas;Michal, Kryczka;Angel, Cuevas;Carmen, Guerrero;Arturo, Azcorra
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.7 no.9
    • /
    • pp.2246-2267
    • /
    • 2013
  • BitTorrent is one of the most important applications in the current Internet. Despite of its interest, we still have little knowledge regarding the connectivity properties of real BitTorrent swarms. In this paper we leverage a dataset including the connectivity information of 250 real torrents and more than 150k peers to carefully study the connectivity properties of peers. The main topology parameters of the studied swarms suggest that they are significantly less resilient than random graphs. The analysis of the peer level connectivity properties reveals that peers continuously change more than half of their neighbours. Furthermore, we also find that a leecher typically keeps stable connections with a handful of neighbours with which it exchanges most of its traffic whereas seeders do not establish long-term connections with any peer so that they can homogeneously distribute chunks among leechers. Finally, we have discovered that a significant portion of the studied peers (45%) have an important locality-biased neighbourhood composition.

An Incentive mechanism for VOD Streaming Under Insufficient System Resources (한정된 자원 환경에서의 주문형 비디오 스트리밍 서비스를 위한 효율적인 인센티브 메커니즘)

  • Shin, Kyuyong;Lee, Jongdeog;Shin, Jinhee;Park, Chanjin
    • Journal of the Korea Society of Computer and Information
    • /
    • v.18 no.4
    • /
    • pp.65-77
    • /
    • 2013
  • Recently the ratio of the Internet traffic generated by video streaming applications including video-on-demand (VOD) is getting higher and higher, while P2P-based naive content distribution has been the main source of the Internet traffic in the past. As a result, the paradigm of cooperatively distributed systems (e.g., P2P) is changing to support streaming applications. Most P2P assisted approaches for video streaming today are based on Bit Torrent thanks to its simplicity of implementation and easy adaptability. They, however, have immanent vulnerability to free-riding inherited from Bit Torrent, which inevitably hurts their performance under limited system resources with free-riding. This paper studies the weakness to free-riding of existing Bit Torrent-based video streaming applications and investigates the adaptability of T-Chain (which was originally designed to prevent free-riding in cooperatively distributed systems) to video streaming applications. Our experiment results show that the video streaming approach based on T-Chain outperforms most existing Bit Torrent-based ones by 60% on average under limited system resources with free-riding.

The Internet: An (other) agent that disseminates Japanese 'soft power' resources

  • Bunyavejchewin, Poowin
    • Journal of Contemporary Eastern Asia
    • /
    • v.11 no.1
    • /
    • pp.21-29
    • /
    • 2012
  • The popularity of the Internet has affected international politics in many ways; however, it is seemingly overlooked by most scholars, and in particular, realists who view the Internet as low-politics. This article argues that the impact of the Internet on international politics should not be underestimated. By focusing on the capabilities of the Internet in general and P2P networks in particular, this paper shows how the Internet is able to disseminate soft power resources. This is demonstrated by an examination of the dissemination of Japanese soft power resources through BitTorrent. Finally, it is concluded that the Internet is a plausible agent for distributing the resources of soft power; however, once disseminated, soft power resources do not always transform into soft power. In the end, contextual conditions within states always apply.