| Part ofa series on |
| File sharing |
|---|
 |
Video on demand sites |
File sharing networks |
Streaming programs |
Anonymous file sharing |
Development and societal aspects |
Ananonymous P2P communication system is apeer-to-peerdistributed application in which thenodes, which are used to share resources, or participants areanonymous orpseudonymous.[1] Anonymity of participants is usually achieved by special routingoverlay networks that hide the physical location of each node from other participants.[2]
Interest in anonymous P2P systems has increased in recent years for many reasons, ranging from the desire to share files without revealing one's network identity and riskinglitigation[3] to distrust in governments, concerns overmass surveillance anddata retention, andlawsuits againstbloggers.[4]
There are many reasons to use anonymous P2P technology; most of them are generic to all forms of online anonymity.
P2P users who desire anonymity usually do so as they do not wish to be identified as a publisher (sender), or reader (receiver), of information. Common reasons include:
A particularly open view on legal and illegal content is given inThe Philosophy Behind Freenet.
Governments are also interested in anonymous P2P technology. TheUnited States Navy funded the originalonion routing research that led to the development of theTor network, which was later funded by theElectronic Frontier Foundation and is now developed by the non-profit organization The Tor Project, Inc.
While anonymous P2P systems may support the protection of unpopular speech, they may also protect illegal activities, such asfraud,libel, the exchange of illegalpornography, the unauthorized copying ofcopyrighted works, or the planning of criminal activities. Critics of anonymous P2P systems hold that these disadvantages outweigh the advantages offered by such systems, and that other communication channels are already sufficient for unpopular speech.
Proponents of anonymous P2P systems believe that all restrictions on free speech serve authoritarian interests, information itself is ethically neutral, and that it is the people acting upon the information that can be good or evil. Perceptions of good and evil can also change (seemoral panic); for example, if anonymous peer-to-peer networks had existed in the 1950s or 1960s, they might have been targeted for carrying information aboutcivil rights oranarchism.
Easily accessible anonymous P2P networks are seen by some as a democratization ofencryption technology, giving the general populace access to secure communications channels already used by governments. Supporters of this view, such asPhil Zimmermann, argue that anti-surveillance technologies help to equalize power between governments and their people,[5] which is the actual reason for banning them.John Pilger opines that monitoring of the populace helps to contain threats to the "consensual view of established authority"[6] or threats to the continuity of power structures and privilege.
Some claim that truefreedom of speech, especially on controversial subjects, is difficult or impossible unless individuals can speak anonymously. If anonymity is not possible, one could be subjected to threats or reprisals for voicing an unpopular view. This is one reason why voting is done by secretballot in many democracies. Controversial information which a party wants to keep hidden, such as details about corruption issues, is often published or leaked anonymously.
Anonymous blogging is one widespread use of anonymous networks. While anonymous blogging is possible on the non-anonymous internet to some degree too, a provider hosting the blog in question might be forced to disclose the blogger'sIP address (as when Google revealed an anonymous blogger's identity[7]). Anonymous networks provide a better degree of anonymity. Flogs (anonymous blogs) in Freenet,Syndie and other blogging tools inI2P andOsiris sps are some examples of anonymous blogging technologies.
One argument for anonymous blogging is a delicate nature of work situation. Sometimes a blogger writing under their real name faces a choice between either staying silent or causing a harm to themselves, their colleagues or the company they work for.[8]
Another reason is risk of lawsuits. Some bloggers have faced multimillion-dollar lawsuits[9] (although they were later dropped completely[10]); anonymous blogging provides protection against such risks.
On the non-anonymous Internet, adomain name like "example.com" is a key to accessing information. The censorship of the Wikileaks website shows that domain names are extremely vulnerable to censorship.[citation needed] Some domain registrars have suspended customers' domain names even in the absence of a court order.[citation needed]
For the affected customer, blocking of a domain name is a far bigger problem than a registrar refusing to provide a service; typically, the registrar keeps full control of the domain names in question. In the case of a European travel agency, more than 80 .com websites were shut down without any court process and held by the registrar since then. The travel agency had to rebuild the sites under the .nettop-level domain instead.[11]
On the other hand, anonymous networks do not rely ondomain name registrars. For example, Freenet,I2P and Tor hidden services implement censorship-resistant URLs based onpublic-key cryptography: only a person having the correct private key can update the URL or take it down.
Anonymous P2P also has value in normal daily communication. When communication is anonymous, the decision to reveal the identities of the communicating parties is left up to the parties involved and is not available to a third party. Often there is no need or desire by the communicating parties to reveal their identities. As a matter of personal freedom, many people do not want processes in place by default which supply unnecessary data. In some cases, such data could be compiled into histories of their activities.
For example, most current phone systems transmit caller ID information by default to the called party (although this can be disabled either for a single call or for all calls). If a person calls to make an inquiry about a product or the time of a movie, the party called has a record of the calling phone number, and may be able to obtain the name, address and other information about the caller. This information is not available about someone who walks into a store and makes a similar inquiry.
Online surveillance, such as recording and retaining details of web and e-mail traffic, may have effects on lawful activities.[12] People may be deterred from accessing or communicating legal information because they know of possible surveillance and believe that such communication may be seen as suspicious. According to law professorDaniel J. Solove, such effects "harm society because, among other things, they reduce the range of viewpoints being expressed and the degree of freedom with which to engage in political activity."[13]
Most countries ban or censor the publication of certainbooks andmovies, and certain types of content. Other material is legal to possess but not to distribute; for example, copyright andsoftware patent laws may forbid its distribution. These laws are difficult or impossible to enforce in anonymous P2P networks.
Withanonymous money, it becomes possible to arrange anonymous markets where one can buy and sell just about anything anonymously. Anonymous money could be used to avoidtax collection. However, any transfer of physical goods between two parties could compromise anonymity.[14]
Proponents argue that conventionalcash provides a similar kind of anonymity, and that existing laws are adequate to combat crimes liketax evasion that might result from the use of anonymous cash, whether online or offline.[15]
Some of the networks commonly referred to as "anonymous P2P" are truly anonymous, in the sense that network nodes carry no identifiers. Others are actually pseudonymous: instead of being identified by their IP addresses, nodes are identified by pseudonyms such as cryptographic keys. For example, each node in theMUTE network has an overlay address that is derived from its public key. This overlay address functions as a pseudonym for the node, allowing messages to be addressed to it. In Freenet, on the other hand, messages are routed using keys that identify specific pieces of data rather than specific nodes; the nodes themselves are anonymous.
The termanonymous is used to describe both kinds of network because it is difficult—if not impossible—to determine whether a node that sends a message originated the message or is simply forwarding it on behalf of another node. Every node in an anonymous P2P network acts as a universal sender anduniversal receiver to maintain anonymity. If a node was only a receiver and did not send, then neighbouring nodes would know that the information it was requesting was for itself only, removing anyplausible deniability that it was the recipient (and consumer) of the information. Thus, in order to remain anonymous, nodes must ferry information for others on the network.
Originally, anonymous networks were operated by small and friendly communities of developers. As interest in anonymous P2P increased and the user base grew, malicious users inevitably appeared and tried different attacks. This is similar to the Internet, where widespread use has been followed by waves ofspam and distributed DoS (Denial of Service) attacks. Such attacks may require different solutions in anonymous networks. For example, blacklisting of originator network addresses does not work because anonymous networks conceal this information. These networks are more vulnerable to DoS attacks as well due to the smaller bandwidth, as has been shown in examples on the Tor network.
A conspiracy to attack an anonymous network could be considered criminal computer hacking, though the nature of the network makes this impossible to prosecute without compromising the anonymity of data in the network.
Like conventional P2P networks, anonymous P2P networks can implement either opennet ordarknet (often named friend-to-friend) network type. This describes how a node on the network selects peer nodes:
Some networks like Freenet support both network types simultaneously (a node can have some manually added darknet peer nodes and some automatically selected opennet peers) .
In a friend-to-friend (or F2F) network, users only make direct connections with people they know. Many F2F networks support indirect anonymous or pseudonymous communication between users who do not know or trust one another. For example, a node in a friend-to-friend overlay can automatically forward a file (or a request for a file) anonymously between two "friends", without telling either of them the other's name or IP address. These "friends" can in turn forward the same file (or request) to their own "friends", and so on. Users in a friend-to-friend network cannot find out who else is participating beyond their own circle of friends, so F2F networks can grow in size without compromising their users' anonymity.
Some friend-to-friend networks allow the user to control what kind of files can be exchanged with "friends" within the node, in order to stop them from exchanging files that user disapproves of.
Advantages and disadvantages of opennet compared to darknet are disputed, see friend-to-friend article for summary.
Private P2P networks are P2P networks that only allow some mutually trusted computers to share files. This can be achieved by using a central server orhub to authenticate clients, in which case the functionality is similar to a privateFTP server, but with files transferred directly between the clients. Alternatively, users can exchange passwords or keys with their friends to form a decentralized network.
Examples include:
Friend-to-friend networks are P2P networks that allows users only to make direct connections with people they know. Passwords or digital signatures can be used for authentication.
Examples include :
The following networks only exist as design or are in development
[28] Website is down and clients are no longer functional.
It is possible to implement anonymous P2P on awireless mesh network; unlike fixed Internet connections, users don't need to sign up with an ISP to participate in such a network, and are only identifiable through their hardware.
Protocols forwireless mesh networks areOptimized Link State Routing Protocol (OLSR) and the follow-up protocolB.A.T.M.A.N., which is designed for decentralized auto-IP assignment. See alsoNetsukuku.
Even if a government were to outlaw the use of wireless P2P software, it would be difficult to enforce such a ban without a considerable infringement of personal freedoms. Alternatively, the government could outlaw the purchase of the wireless hardware itself.
{{cite journal}}: CS1 maint: multiple names: authors list (link){{citation}}: CS1 maint: work parameter with ISBN (link){{cite journal}}: CS1 maint: multiple names: authors list (link)