BITTORRENT TECHNOLOGY Anthony Pervetich HISTORY Bram Cohen Designed

BITTORRENT TECHNOLOGY Anthony Pervetich

HISTORY Bram Cohen Designed the Bit. Torrent protocol in April 2001 Released July 2, 2001 Concept Late 90’s dot com Mojo. Nation Same general concept as Bit. Torrent

TECHNOLOGY P 2 P Protocol Large amounts of data Data transferred in “chunks” Multiple connected peers Key Terms Client Torrent Peer Seed Swarm Tracker

TECHNOLOGY Client Manages downloads and uploads using Bit. Torrent Protocol Clients are numerous because Bit. Torrent is open source Torrent Small metadata file Contains info about the file and tracker Not the files data but a map of where to get it Peer A computer that does not have the full file Actively sharing its portions of the file as well as downloading missing portions to complete the file

TECHNOLOGY Seed A computer that has a complete copy of the file Actively sharing the file Swarm Group of machines connected to a particular file Includes peers and seeds Tracker Server that coordinates clients Opening a torrent contacts the tracker Tracker gives client a list of peers to connect to Tracker sites list torrents

BITTORRENT PROCESS Peer creates torrent file with a client Usually uploaded to a tracker site Peer downloads torrent file File opened by client and sends a request to the tracker for info Usually same site that torrent was found at Client manages the download Downloads occur in a random or “rarest first” order Small requests made over different TCP sockets

BITTORRENT ANIMATION

ADVANTAGES Only small amounts of data from each peer Not as taxing on the peers machine as other file sharing protocols Redundancy Small “chunks” from many users make downloading more reliable If tracker server goes down new connections cannot be made but existing connections still open Speed Very fast for large files

DISADVANTAGES Speed Popularity of the file (i. e. how many people sharing) directly affects speed and availability May be slow at first until enough connections are made Streaming Randomly downloading “chunks” of a file does not allow streaming Selfishness Peers can set limitations on their sharing

WHERE TO GET TORRENT FILES Index Sites Provides torrent names and description Links to a tracker site Tracker Sites Usually an Index site also Many sites both private and public Public Anyone can use the site Private A user is required to register an account with the site

THE PIRATE BAY

DEMONOID

MININOVA

BITTORRENT CLIENTS Clients Numerous due to Bit. Torrent being open source Vuze (formerly Azeureus) Popular client Supported by ads HD Network Search through different channels for content Stressing HD format Integrated Search tools Search different sites from the client New video streaming capabilities Fully downloaded file Converted and streamed to different media

VUZE

QUESTIONS?

SOURCES http: //www. vuze. com/app http: //en. wikipedia. org/wiki/Bram_Cohen http: //en. wikipedia. org/wiki/Bit. Torrent_(protocol) http: //www. dessent. net/btfaq/