From Torrent to Magnet Link Presenter: Guanlong Zhou Fan Feng a new way of sharing on P2P network TRIBLER: A social-based Peer-to-Peer system.

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Presentation transcript:

From Torrent to Magnet Link Presenter: Guanlong Zhou Fan Feng a new way of sharing on P2P network TRIBLER: A social-based Peer-to-Peer system

The motivation for this project In our previous project, there is one problem with Tibler that if the server or the tracker get blocked or closed, then the file cannot be download anymore which limits the efficiency and convenience of the p2p sharing system. So in this final project, we are going to develop a new method using magnet link to make sure even with the server or the tracker be closed the file still can be download

Introduction of Magnet URI Definition DHT Network Magnet link

Introduction of Magnet Link Magnet link consists: –magnet: –?xt=urn:btih: –5dee65101db281ac9c46344cd6b175cdc ad53426 –&dn=name

Main Advantage of Magnet Link easy to transfer difficult to be tracked/blocked

The problem here we found is that because of a lack of central tracker, TRIBLER will suffer from an extremely hard period of bootstrapping if there is only a few of peers on the swam. Because the amount of peers is very small, it becomes very difficult to connect two peers who is downloading/has downloaded the same files. The peers in the Buddycast list are totally random which even increase the difficulty of connecting two peers of sharing the same files.

What we have done to solve this problem? Convert.torrent file to magnet link Connect OpenTracker Servers into P2P “Built” a search engine on the P2P network

.torrent file ExampleFile:ubuntu desktop-i386.torrent Info Hash:87250A39 78F312D4 3F898B0B B9BA3B31 C853A881 Tracker:URL1:udp://tracker.publicbt.com/announce URL2:udp://tracker.openbittorrent.com/announce URL3: … Metadata: Created On/ Created By/ Piece Length(512KB)… Filename: ubuntu desktop-i386.iso Filesize: 707MB Information URL: Download.torrent file: Tech supported: TorrentEditor Class: BEncode magnet:?xt=urn:btih:87250A3978F312D43F898B0BB9BA3B31C853A881

OpenTracker Example Site: openbittorrent.com publicbt.com istole.it Example Tracker: udp://tracker.openbittorrent.com:80 udp://tracker.publicbt.com:80 udp://tracker.ccc.de:80

OpenTracker An aggregated scrape file for the entire cluster can be found at each opentracker website. The file is updated every specific period. Example file:

Tor2mag.com File hosting service provider: Programming language: Database Platform: DNS hosting service provider:

Tor2mag.com Torrent convert service: Magnet Link Search Engine: search.tor2mag.com

Result: Input: ubuntu desktop-i386.torrent Output: magnet:?xt=urn:btih:87250A3978F312D43F898B0BB9BA3B31C853A881 &tr.0= nc.com/announce&tr.2= nce&tr.5=udp://tracker.istole.it:80/announce&tr.6= unce&tr.7=udp://tracker.publicbt.com:80/announce&tr.8= entfrancais.com/announce&tr.9= Permanent Page Link: 3F898B0BB9BA3B31C853A881 Uploaded file was deleted immediately after the conversion!

Result: Search: Ubuntu Output: Find 1058 Results ubuntu desktop-i386.iso ubuntu server-amd64.iso ubuntu server-amd64.iso ubuntu server-i386.iso ubuntu desktop-amd64.iso ubuntu server-amd64.iso... Detail information link: No real file is saved on the server. Only the information.

What is the advantage? a3978f312d43f898b0bb9ba3b31c853a881 HTTP/FTP download: Traditional BT download: Website ->.torrent file -> Tracker New Magnet-Link download:

Reference 1.J. A. Pouwelse, P. Garbacki, J. Wang, A. Bakker, J. Yang, A. Iosup, D. H. J. Epema, M. Reinders, M. R. van Steen, and H. J. Sips.TRIBLER: a social-based peer-to-peer system: Research Articles. Concurr. Comput. : Pract. Exper., 20:127–138, February Usman Khurshid: What is the difference between a Torrent File and a Magnet link.Jan 16,2012.