Torrent poisoning

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Torrent poisoning is intentionally sharing corrupt data or data with misleading file names using the BitTorrent protocol. This practice of uploading fake torrents is sometimes carried out by anti-infringement organisations as an attempt to prevent the peer-to-peer (P2P) sharing of copyrighted content, and to gather the IP addresses of downloaders. [1]

Contents

Methods of attack

Decoy insertion

Decoy insertion (or content pollution) is a method by which corrupted versions of a particular file are inserted into the network. This deters users from finding an uncorrupted version and also increases distribution of the corrupted file. [2] A malicious user pollutes the file by converting it into another format that is indistinguishable from uncorrupted files (e.g. it may have similar or same metadata). In order to entice users to download the decoys, malicious users may make the corrupted file available via high bandwidth connections. [3] This method consumes a large amount of computing resources since the malicious server must respond to a large quantity of requests. [4] As a result, queries return principally corrupted copies such as a blank file or executable files infected with a virus. [5] . There were known cases when a company had created a special version of a game and published it on file sharing services advertising it as cracked, having undocumented hidden functionality, making it impossible to win this variant of the game.

Index poisoning

This method targets the index found in P2P file sharing systems. The index allows users to locate the IP addresses of desired content. Thus, this method of attack makes searching difficult for network users. The attacker inserts a large amount of invalid information into the index to prevent users from finding the correct resource. [3] Invalid information could include random content identifiers or fake IP addresses and port numbers. [5] When a user attempts to download the corrupted content, the server will fail to establish a connection due to the large volume of invalid information. Users will then waste time trying to establish a connection with bogus users thus increasing the average time it takes to download the file. [3] The index poisoning attack requires less bandwidth and server resources than decoy insertion. Furthermore, the attacker does not have to transfer files nor respond to requests. For this reason, index poisoning requires less effort than other methods of attack. [4]

Spoofing

Some companies that disrupt P2P file sharing on behalf of content providers create their own software in order to launch attacks. MediaDefender has written their own program which directs users to non-existent locations via bogus search results. As users typically select one of the top five search results only, this method requires users to persevere beyond their initial failed attempts to locate the desired file. [6] The idea is that many users will simply give up their search through frustration.

Interdiction

This method of attack prevents distributors from serving users and thus slows P2P file sharing. The attacker’s servers constantly connect to the desired file, which floods the provider’s upstream bandwidth and prevents other users from downloading the file. [6]

Selective content poisoning

Selective content poisoning (also known as proactive or discriminatory content poisoning) attempts to detect copyright violators while allowing legitimate users to continue to enjoy the service provided by an open P2P network. The protocol identifies a peer with its endpoint address while the file index format is changed to incorporate a digital signature. A peer authentication protocol can then establish the legitimacy of a peer when she downloads and uploads files. Using identity based signatures, the system enables each peer to identify infringing users without the need for communication with a central authority. The protocol then sends poisoned chunks to these detected users requesting a copyright protected file only. If all legitimate users simply deny download requests from known infringers, the latter can usually accumulate clean chunks from colluders (paid peers who share content with others without authorization). However, this method of content poisoning forces illegitimate users to discard even clean chunks, prolonging their download time. [7]

Voluntary Collective Licensing and the Open Music Model are theoretical systems where users pay a subscription fee for access to a file-sharing network, and are able to legally download and distribute copyright content. [8] Selective content poisoning could potentially be used here to limit access to legitimate and subscribed users, by providing poisoned content to non-subscribed users who attempt to illegitimately use the network. [9]

Eclipse attack

The eclipse attack (also known as routing-table poisoning), instead of poisoning the network, targets requesting peers directly. In this attack, the attacker takes over the peer’s routing table so that they are unable to communicate with any other peer except the attacker. As the attacker replicates the whole network for the targeted peer, they can manipulate them in a number of ways. For example, the attacker can specify which search results are returned. The attacker can also modify file comments. The peer’s requests can also be directed back into the network by the attacker and can also be modified. It also checks data randomly for any errors found in that. [10]

Uncooperative-peer attack

In this attack, the attacker joins the targeted swarm and establishes connections with many peers. However, the attacker never provides any chunks (authentic or otherwise) to the peers. A common version of this attack is the "chatty peer" attack. The attacker establishes connection with targeted peers via the required handshake message, followed by a message advertising that they have a number of available chunks. Not only does the attacker never provide any chunks, they also repeatedly resend the handshake and message. These attacks prevent downloads as, essentially, the peer wastes time dealing with the attacker, instead of downloading chunks from others. [11]

Barriers to torrent poisoning

There are several reasons why content providers and copyright holders may not choose torrent poisoning as a method for guarding their content. First, before injecting decoys, content providers have to normally monitor the BitTorrent network for signs that their content is being illegally shared (this includes watching for variations of files and files in compressed formats).

This process can be expensive and time-consuming. As a result, most poisoning is only continued for the first few months following a leak or release. [6] Second, it is also unlikely that torrent poisoning can be successful in disrupting every illegal download.

Instead, the aim of content providers is to make illegal downloads statistically less likely to be clean and complete, in the hope that users will be discouraged from illegally downloading copyright material. Content providers and copyright holders may decide that the financial outlay is not worth the end result of their efforts.

Countermeasures

The methods of attack described above are not particularly effective on their own, as for each measure effective countermeasures have evolved. These measures must be combined in order to have a significant impact on illegal peer-to-peer filesharing using BitTorrent protocols and Torrent files.

In September 2004, Altnet sued the Recording Industry Association of America, Overpeer, Loudeye, MediaSentry and others, claiming that their spoofing services violated Altnet's patent for a file identification method called TrueNames. [13] [14]

In 2005 the Finnish anti-infringement organisation Viralg claimed that their software, which uses a similar approach to spoofing, could be used to bring an end to illegal P2P file sharing. [13] The firm offered "total blocking of peer 2 peer sharing for your intellectual property" and claimed that its "patented virtual algorithm blocks out all illegal swapping of your data". [15] as well as claiming that their approach was 99% effective. [13] Despite these claims, the algorithm has not yet been tested with BitTorrent. [16] A group of Finnish musicians requested an investigation into the company, arguing that their software was effectively a virus and was in violation of Finnish law. The investigation was declined by Finnish police, and later by the Finnish parliamentary ombudsman. [17]

In some jurisdictions, there were concerns that content providers and copyright holders engaging in poisoning activities may be held liable for damages to users' computers. In the USA in 2002, Representative Howard Berman proposed the Peer To Peer Piracy Prevention Act, which would have granted immunity to copyright holders for taking steps to prevent the illegal distribution of their content (i.e. poisoning activities) on P2P networks, as long as they did not go as far as to harm the files stored on a P2P user's computer. [18] [19] However, the bill died later in 2002 when the Congressional Term ended and has not been reintroduced. [20]

High-profile cases

In 2005, it was reported that HBO was poisoning torrents of its show Rome by providing chunks of garbage data to users. [21] HBO were also reported to have sent cease-and-desist letters to the Internet Service Providers (ISPs) of downloaders they believe have illegally downloaded episodes of The Sopranos .

Although not targeted specifically at BitTorrent, Madonna's American Life album was an early example of content poisoning. Before the release of the album, tracks that appeared to be of similar length and file size to the real album tracks were leaked by the singer's record label. The tracks featured only a clip of Madonna saying "What the fuck do you think you're doing?" followed by minutes of silence. [22] [23]

Similarly, the band Barenaked Ladies released a number of tracks online in 2000 that appeared to be legitimate copies of tracks from the band's latest album. Each file contained a short sample of the song, followed by a clip of a band member saying, "Although you thought you were downloading our new single, what you were actually downloading is an advertisement for our new album.” [24]

After an unauthorized copy of Michael Moore’s movie Sicko was uploaded online, it became a hit on P2P websites such as Pirate Bay. MediaDefender was hired to poison torrents using decoy insertion. [25]

In an example of Internet vigilantism, anti-infringement vigilantes have been known to create viruses that are distributed exclusively via P2P networks, and are designed to attack mp3s and other music files stored on a user's PC. The Nopir-B worm, which originated in France, poses as a DVD copying program and deletes all the mp3 files on a user's computer, regardless of whether or not they were legally obtained. [13] [26]

On 19 October 2007 Associated Press (AP) released information accusing the broadband service provider Comcast of "hindering" P2P file sharing traffic. [27] Tests conducted by AP have shown that Comcast hindered the uploading of complete files to BitTorrent. The Federal Communications Commission conducted public hearings in response to the allegations. Comcast argued that it was regulating network traffic to enable reasonable downloading times for the majority of users. [28] On 21 August 2008 the FCC issued an order which stated that Comcast's network management was unreasonable and that Comcast must terminate the use of its discriminatory network management by the end of the year. Comcast complied with the order and appealed. On 6 June 2010, the District Court of Appeals for the Columbia vacated the FCC order in Comcast Corp. v. FCC.

See also

Related Research Articles

Peer-to-peer Type of decentralized and distributed network architecture

Peer-to-peer (P2P) computing or networking is a distributed application architecture that partitions tasks or workloads between peers. Peers are equally privileged, equipotent participants in the application. They are said to form a peer-to-peer network of nodes.

Uploading refers to transmitting data from one computer system to another through means of a network. Common methods of uploading include: uploading via web browsers, FTP clients, and terminals (SCP/SFTP). Uploading can be used in the context of clients that send files to a central server. While uploading can also be defined in the context of sending files between distributed clients, such as with a peer-to-peer (P2P) file-sharing protocol like BitTorrent, the term file sharing is more often used in this case. Moving files within a computer system, as opposed to over a network, is called file copying.

BitTorrent Peer-to-peer file sharing protocol

BitTorrent is a communication protocol for peer-to-peer file sharing (P2P), which enables users to distribute data and electronic files over the Internet in a decentralized manner.

Broadcatching is the downloading of digital content that has been made available over the Internet using RSS.

BitComet

BitComet is a cross-protocol BitTorrent, HTTP and FTP client written in C++ for Microsoft Windows and available in 52 different languages. Its first public release was version 0.28. The current BitComet logo has been used since version 0.50.

MediaDefender, Inc. was a company that fought copyright infringement that offered services designed to prevent alleged copyright infringement using peer-to-peer distribution. They used unusual tactics such as flooding peer-to-peer networks with decoy files that tie up users' computers and bandwidth. MediaDefender was based in Los Angeles, California in the United States. As of March 2007, the company had approximately 60 employees and used 2,000 servers hosted in California with contracts for 9 Gbit/s of bandwidth.

The eDonkey Network is a decentralized, mostly server-based, peer-to-peer file sharing network created in 2000 by US developers Jed McCaleb and Sam Yagan that is best suited to share big files among users, and to provide long term availability of files. Like most sharing networks, it is decentralized, as there is no central hub for the network; also, files are not stored on a central server but are exchanged directly between users based on the peer-to-peer principle.

BitTorrent is an ad-supported BitTorrent client developed by Bram Cohen and BitTorrent, Inc. used for uploading and downloading files via the BitTorrent protocol. BitTorrent was the first client written for the protocol. It is often nicknamed Mainline by developers denoting its official origins. Since version 6.0 the BitTorrent client has been a rebranded version of μTorrent. As a result, it is no longer open source. It is currently available for Microsoft Windows, Mac, Linux, iOS and Android.

This is a timeline of events in the history of networked file sharing.

Peer-to-peer file sharing is the distribution and sharing of digital media using peer-to-peer (P2P) networking technology. P2P file sharing allows users to access media files such as books, music, movies, and games using a P2P software program that searches for other connected computers on a P2P network to locate the desired content. The nodes (peers) of such networks are end-user computers and distribution servers.

Rainberry, Inc., formerly known as BitTorrent, Inc., is an American company that is responsible for the ongoing development of the BitTorrent peer-to-peer protocol, as well as the ongoing development of μTorrent and BitTorrent Mainline, two clients for that protocol. Files transferred using the BitTorrent protocol constitute a significant slice of all Internet traffic. At its peak, 170 million people used the protocol every month, according to the company's website. The company was founded on September 22, 2004 by Bram Cohen and Ashwin Navin. In 2018, the company was acquired by cryptocurrency startup TRON, and Bram Cohen left the company.

The following is a general comparison of BitTorrent clients, which are computer programs designed for peer-to-peer file sharing using the BitTorrent protocol.

This is a glossary of jargon related to peer-to-peer file sharing via the BitTorrent protocol.

File sharing is the practice of distributing or providing access to digital media, such as computer programs, multimedia, program files, documents or electronic books/magazines. It involves various legal aspects as it is often used to exchange intellectual property that is subject to copyright law or licensing.

The use of the BitTorrent protocol for sharing of copyrighted content generated a variety of novel legal issues. While the technology and related platforms are legal in many jurisdictions, law enforcement and prosecutorial agencies are attempting to address this avenue of copyright infringement. Notably, the use of BitTorrent in connection with copyrighted material may make the issuers of the BitTorrent file, link or metadata liable as an infringing party under some copyright laws. Similarly, the use of BitTorrent to procure illegal materials could potentially create liability for end users as an accomplice.

TorrentFreak Blog on file sharing, copyright infringement, and digital rights

TorrentFreak (TF) is a blog dedicated to reporting the latest news and trends on the BitTorrent protocol and file sharing, as well as on copyright infringement and digital rights.

File sharing is the practice of distributing or providing access to digital media, such as computer programs, multimedia, documents or electronic books. File sharing may be achieved in a number of ways. Common methods of storage, transmission and dispersion include manual sharing utilizing removable media, centralized servers on computer networks, World Wide Web-based hyperlinked documents, and the use of distributed peer-to-peer networking.

libtorrent

libtorrent is an open-source implementation of the BitTorrent protocol. It is written in and has its main library interface in C++. Its most notable features are support for Mainline DHT, IPv6, HTTP seeds and μTorrent's peer exchange. libtorrent uses Boost, specifically Boost.Asio to gain its platform independence. It is known to build on Windows and most Unix-like operating systems.

In the BitTorrent file distribution system, a torrent file or meta-info file is a computer file that contains metadata about files and folders to be distributed, and usually also a list of the network locations of trackers, which are computers that help participants in the system find each other and form efficient distribution groups called swarms. A torrent file does not contain the content to be distributed; it only contains information about those files, such as their names, folder structure, and sizes obtained via cryptographic hash values for verifying file integrity. The term torrent may refer either to the metadata file or to the files downloaded, depending on the context.

File sharing in Japan is notable for both its size and sophistication.

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