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Due to the nature of this approach, the download of any file can be halted at any time and be resumed at a later date, without the loss of previously downloaded information, which in turn makes BitTorrent particularly useful in the transfer of larger files.
This also enables the client to seek out readily available pieces and download them immediately, rather than halting the download and waiting for the next and possibly unavailable piece in line, which typically reduces the overall time of the download. This eventual transition from peers to seeders determines the overall "health" of the file as determined by the number of times a file is available in its complete form.
The distributed nature of BitTorrent can lead to a flood-like spreading of a file throughout many peer computer nodes. As more peers join the swarm, the likelihood of a successful download by any particular node increases. Relative to traditional Internet distribution schemes, this permits a significant reduction in the original distributor's hardware and bandwidth resource costs. Distributed downloading protocols in general provide redundancy against system problems, reduce dependence on the original distributor,  and provide sources for the file which are generally transient and therefore there is no single point of failure as in one way server-client transfers.
Though both ultimately transfer files over a network, a BitTorrent download differs from a one way server-client download as is typical with an HTTP or FTP request, for example in several fundamental ways:. Taken together, these differences allow BitTorrent to achieve much lower cost to the content provider, much higher redundancy, and much greater resistance to abuse or to " flash crowds " than regular server software.
However, this protection, theoretically, comes at a cost: downloads can take time to rise to full speed because it may take time for enough peer connections to be established, and it may take time for a node to receive sufficient data to become an effective uploader. This contrasts with regular downloads such as from an HTTP server, for example that, while more vulnerable to overload and abuse, rise to full speed very quickly, and maintain this speed throughout.
In the beginning, BitTorrent's non-contiguous download methods made it harder to support "streaming playback". In , the client Popcorn Time allowed for streaming of BitTorrent video files. Since then, more and more clients are offering streaming options.
The BitTorrent protocol provides no way to index torrent files. As a result, a comparatively small number of websites have hosted a large majority of torrents, many linking to copyrighted works without the authorization of copyright holders, rendering those sites especially vulnerable to lawsuits. Public torrent-hosting sites such as The Pirate Bay allow users to search and download from their collection of torrent files. Users can typically also upload torrent files for content they wish to distribute.
Often, these sites also run BitTorrent trackers for their hosted torrent files, but these two functions are not mutually dependent: a torrent file could be hosted on one site and tracked by another unrelated site. Web search engines allow the discovery of torrent files that are hosted and tracked on other sites; examples include The Pirate Bay and BTDigg.
These sites allow the user to ask for content meeting specific criteria such as containing a given word or phrase and retrieve a list of links to torrent files matching those criteria. This list can often be sorted with respect to several criteria, relevance seeders-leechers ratio being one of the most popular and useful due to the way the protocol behaves, the download bandwidth achievable is very sensitive to this value.
Metasearch engines allow one to search several BitTorrent indices and search engines at once. The Tribler BitTorrent client was among the first to incorporate built-in search capabilities. With Tribler, users can find. The software includes the ability to recommend content as well. After a dozen downloads, the Tribler software can roughly estimate the download taste of the user, and recommend additional content. In May , researchers at Cornell University published a paper proposing a new approach to searching a peer-to-peer network for inexact strings,  which could replace the functionality of a central indexing site.
A year later, the same team implemented the system as a plugin for Vuze called Cubit  and published a follow-up paper reporting its success. A somewhat similar facility but with a slightly different approach is provided by the BitComet client through its "Torrent Exchange"  feature. Whenever two peers using BitComet with Torrent Exchange enabled connect to each other they exchange lists of all the torrents name and info-hash they have in the Torrent Share storage torrent files which were previously downloaded and for which the user chose to enable sharing by Torrent Exchange.
Thus each client builds up a list of all the torrents shared by the peers it connected to in the current session or it can even maintain the list between sessions if instructed. At any time the user can search into that Torrent Collection list for a certain torrent and sort the list by categories. When the user chooses to download a torrent from that list, the.
Users find a torrent of interest on a torrent index site or by using a search engine built into the client, download it, and open it with a BitTorrent client. The client connects to the tracker s or seeds specified in the torrent file, from which it receives a list of seeds and peers currently transferring pieces of the file s. The client connects to those peers to obtain the various pieces. If the swarm contains only the initial seeder, the client connects directly to it, and begins to request pieces.
Clients incorporate mechanisms to optimize their download and upload rates. The effectiveness of this data exchange depends largely on the policies that clients use to determine to whom to send data. Clients may prefer to send data to peers that send data back to them a " tit for tat " exchange scheme , which encourages fair trading. But strict policies often result in suboptimal situations, such as when newly joined peers are unable to receive any data because they don't have any pieces yet to trade themselves or when two peers with a good connection between them do not exchange data simply because neither of them takes the initiative.
To counter these effects, the official BitTorrent client program uses a mechanism called "optimistic unchoking", whereby the client reserves a portion of its available bandwidth for sending pieces to random peers not necessarily known good partners, so called preferred peers in hopes of discovering even better partners and to ensure that newcomers get a chance to join the swarm.
Although "swarming" scales well to tolerate "flash crowds" for popular content, it is less useful for unpopular or niche market content. Peers arriving after the initial rush might find the content unavailable and need to wait for the arrival of a "seed" in order to complete their downloads. The seed arrival, in turn, may take long to happen this is termed the "seeder promotion problem".
Since maintaining seeds for unpopular content entails high bandwidth and administrative costs, this runs counter to the goals of publishers that value BitTorrent as a cheap alternative to a client-server approach. The peer distributing a data file treats the file as a number of identically sized pieces, usually with byte sizes of a power of 2, and typically between 32 kB and 16 MB each.
The peer creates a hash for each piece, using the SHA-1 hash function, and records it in the torrent file. Pieces with sizes greater than kB will reduce the size of a torrent file for a very large payload, but is claimed to reduce the efficiency of the protocol. The exact information contained in the torrent file depends on the version of the BitTorrent protocol.
By convention, the name of a torrent file has the suffix. Torrent files have an "announce" section, which specifies the URL of the tracker, and an "info" section, containing suggested names for the files, their lengths, the piece length used, and a SHA-1 hash code for each piece, all of which are used by clients to verify the integrity of the data they receive. Though SHA-1 has shown signs of cryptographic weakness, Bram Cohen did not initially consider the risk big enough for a backward incompatible change to, for example, SHA In the early days, torrent files were typically published to torrent index websites, and registered with at least one tracker.
The tracker maintained lists of the clients currently connected to the swarm. Azureus was the first  BitTorrent client to implement such a system through the distributed hash table DHT method. After the DHT was adopted, a "private" flag — analogous to the broadcast flag — was unofficially introduced, telling clients to restrict the use of decentralized tracking regardless of the user's desires.
The purpose of the flag is to prevent torrents from being shared with clients that do not have access to the tracker. The flag was requested for inclusion in the official specification in August , but has not been accepted yet. BitTorrent does not, on its own, offer its users anonymity. One can usually see the IP addresses of all peers in a swarm in one's own client or firewall program. This may expose users with insecure systems to attacks. In some jurisdictions, copyright holders may launch lawsuits against uploaders or downloaders for infringement, and police may arrest suspects in such cases.
Various means have been used to promote anonymity. For example, the BitTorrent client Tribler makes available a Tor -like onion network , optionally routing transfers through other peers to obscure which client has requested the data. The exit node would be visible to peers in a swarm, but the Tribler organization provides exit nodes. One advantage of Tribler is that clearnet torrents can be downloaded with only a small decrease in download speed from one "hop" of routing.
Most BitTorrent clients are not designed to provide anonymity when used over Tor ,  and there is some debate as to whether torrenting over Tor acts as a drag on the network. Private torrent trackers are usually invitation only, and require members to participate in uploading, but have the downside of a single centralized point of failure.
Oink's Pink Palace and What. Seedbox services download the torrent files first to the company's servers, allowing the user to direct download the file from there. Virtual private networks encrypt transfers, and substitute a different IP address for the user's, so that anyone monitoring a torrent swarm will only see that address.
On 2 May , Azureus 2. Instead just bootstrapping server is used router. The following month, BitTorrent, Inc. In , measurement showed concurrent users of Mainline DHT to be from 10 million to 25 million, with a daily churn of at least 10 million. Both DHT implementations are based on Kademlia. Another idea that has surfaced in Vuze is that of virtual torrents. This idea is based on the distributed tracker approach and is used to describe some web resource. Currently, it is used for instant messaging.
It is implemented using a special messaging protocol and requires an appropriate plugin. Anatomic P2P is another approach, which uses a decentralized network of nodes that route traffic to dynamic trackers. Peer exchange checks with known peers to see if they know of any other peers. With the 3. Web "seeding" was implemented in as the ability of BitTorrent clients to download torrent pieces from an HTTP source in addition to the "swarm".
The advantage of this feature is that a website may distribute a torrent for a particular file or batch of files and make those files available for download from that same web server; this can simplify long-term seeding and load balancing through the use of existing, cheap, web hosting setups. In addition, it would allow the "web seed" to be disabled if the swarm becomes too popular while still allowing the file to be readily available.
The other specification is created by GetRight authors and can rely on a basic HTTP download space using byte serving. In September , a new service named Burnbit was launched which generates a torrent from any URL using webseeding. A technique called broadcatching combines RSS feeds with the BitTorrent protocol to create a content delivery system, further simplifying and automating content distribution.
Steve Gillmor explained the concept in a column for Ziff-Davis in December A script would periodically check the feed for new items, and use them to start the download. Then, I could find a trusted publisher of an Alias RSS feed, and "subscribe" to all new episodes of the show, which would then start downloading automatically — like the "season pass" feature of the TiVo. The RSS feed will track the content, while BitTorrent ensures content integrity with cryptographic hashing of all data, so feed subscribers will receive uncorrupted content.
One of the first and popular software clients free and open source for broadcatching is Miro. The BitTorrent web-service MoveDigital added the ability to make torrents available to any web application capable of parsing XML through its standard REST -based interface in ,  though this has since been discontinued.
Additionally, Torrenthut is developing a similar torrent API that will provide the same features, and help bring the torrent community to Web 2. For this reason, methods have been developed to disguise BitTorrent traffic in an attempt to thwart these efforts. In August , Comcast was preventing BitTorrent seeding by monitoring and interfering with the communication between peers.
Protection against these efforts is provided by proxying the client-tracker traffic via an encrypted tunnel to a point outside of the Comcast network. Another unofficial feature is an extension to the BitTorrent metadata format proposed by John Hoffman  and implemented by several indexing websites. It allows the use of multiple trackers per file, so if one tracker fails, others can continue to support file transfer.
Trackers are placed in groups, or tiers, with a tracker randomly chosen from the top tier and tried, moving to the next tier if all the trackers in the top tier fail. Torrents with multiple trackers can decrease the time it takes to download a file, but also have a few consequences:.
As of December , [update] BitTorrent, Inc. Oversi's ISP hosted NetEnhancer box is designed to "improve peer selection" by helping peers find local nodes, improving download speeds while reducing the loads into and out of the ISP's network. The BitTorrent specification is free to use and many clients are open source , so BitTorrent clients have been created for all common operating systems using a variety of programming languages.
For example, this can be used to centralize file sharing on a single dedicated server which users share access to on the network. The Opera web browser supports BitTorrent natively. Proprietary versions of the protocol which implement DRM , encryption, and authentication are found within managed clients such as Pando. A growing number of individuals and organizations are using BitTorrent to distribute their own or licensed works e.
Independent adopters report that BitTorrent technology reduces demands on private networking hardware and bandwidth, an essential for non-profit groups with large amounts of internet traffic. Some uses of BitTorrent for file sharing may violate laws in some jurisdictions see legislation section. Routers that use network address translation NAT must maintain tables of source and destination IP addresses and ports.
Because BitTorrent frequently contacts 20—30 servers per second, the NAT tables of some consumer-grade routers are rapidly filled. This is a known cause of some home routers ceasing to work correctly. Although the protocol itself is legal,  problems stem from using the protocol to traffic copyright infringing works, since BitTorrent is often used to download otherwise paid content, such as movies and video games.
There has been much controversy over the use of BitTorrent trackers. BitTorrent metafiles themselves do not store file contents. Whether the publishers of BitTorrent metafiles violate copyrights by linking to copyrighted works without the authorization of copyright holders is controversial. Various jurisdictions have pursued legal action against websites that host BitTorrent trackers. High-profile examples include the closing of Suprnova.
BitTorrent search engine The Pirate Bay torrent website, formed by a Swedish group, is noted for the "legal" section of its website in which letters and replies on the subject of alleged copyright infringements are publicly displayed. On 31 May , The Pirate Bay's servers in Sweden were raided by Swedish police on allegations by the MPAA of copyright infringement;  however, the tracker was up and running again three days later.
In the study used to value NBC Universal in its merger with Comcast, Envisional examined the 10, torrent swarms managed by PublicBT which had the most active downloaders. After excluding pornographic and unidentifiable content, it was found that only one swarm offered legitimate content. In the United States, more than , lawsuits have been filed for copyright infringement on BitTorrent since One concern is the UDP flood attack.
To achieve high bandwidths, the underlying protocol used is UDP , which allows spoofing of source addresses of internet traffic. It has been possible to carry out Denial-of-service attacks in a P2P lab environment, where users running BitTorrent clients act as amplifiers for an attack at another service.
Several studies on BitTorrent found files available for download containing malware. From Wikipedia, the free encyclopedia. Peer-to-peer file sharing protocol. This article is about the file sharing protocol. For other uses, see BitTorrent disambiguation.
This section needs expansion. You can help by adding to it. September This article needs to be updated. The reason given is: Some extensions described in this section as experimental have been standardized. This section is factually incorrect about some aspects of v1 and v Please help update this article to reflect recent events or newly available information.
January Main article: Broadcatching. Main article: BitTorrent protocol encryption. Main article: Comparison of BitTorrent clients. Main article: Legal issues with BitTorrent. Archived from the original on 8 February Retrieved 1 June Archived from the original on 20 February Retrieved 18 June Archived from the original on 18 November Retrieved 21 November Yahoo eGroups. Archived from the original on 29 January Retrieved 15 April Archived from the original on 10 November Retrieved 13 September Archived from the original on 12 November Retrieved 28 October Archived from the original on 30 October Palo Alto Networks.
Archived from the original on 31 October Retrieved 7 April Concurrency and Computation: Practice and Experience. ISSN S2CID ISBN Retrieved 7 January Archived from the original on 26 March Retrieved 9 July Archived from the original on 11 November Retrieved 4 January Performance Evaluation. Menasche, A. Rocha, E. Leao, D. Towsley, A. Archived PDF from the original on 23 May Retrieved 9 March Retrieved 14 July David Irwin.
Introduction to Computer Networks and Cybersecurity. Chapter 5. CRC Press. Archived from the original on 2 December Cornell University. Archived PDF from the original on 17 June Archived from the original on 31 December Retrieved 26 May Archived PDF from the original on 29 October Topics: 3, Posts: 8, Topics: 1, Posts: 4, Topics: 1, Posts: 3, Topics: 7, Posts: 26, Topics: 1, Posts: 2, Topics: 4, Posts: 6, Topics: 4, Posts: 5, Topics: Posts: 2, Topics: 97 Posts: Topics: 2, Posts: 4, Topics: 76 Posts: Topics: 3 Posts: 3.
Topics: 25, Posts: 26, Topics: 5, Posts: 5, Topics: 79 Posts: Topics: 1 Posts: 1. The newest registered user is elasmo Peers: , , Seeders: , , Leechers: , Displaying options Show only only new posts only new topics. Forum: Windows 10 Author: ivandubskoj Size: 3. Forum: Windows 8, 8.
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