A dark net or darknet is an overlay network within the Internet that can only be accessed with specific software, configurations, or authorization, and often uses a unique customised communication protocol. Two typical darknet types are social networks, and anonymityproxy networks such as Tor via an anonymized series of connections. The term 'darknet' was popularised by major news outlets to associate with Tor Onion services, when the infamous drug bazaar Silk Road used it, despite the terminology being unofficial. Technology such as Tor, I2P, and Freenet was intended to defend digital rights by providing security, anonymity, or censorship resistance and is used by both criminals and legitimate users. Anonymous communication between whistle-blowers, activists, journalists and news organisations is also facilitated by darknets through use of applications such as SecureDrop.
Terminology
The term originally described computers on ARPANET that were hidden, programmed to receive messages but not respond to or acknowledge anything, thus remaining invisible, in the dark. An account detailed how the first online transaction related to drugs transpired in 1971 when students of the Massachusetts Institute of Technology and Stanford University traded marijuana using ARPANET accounts in the former's Artificial Intelligence Laboratory. Since ARPANET, the usage of dark net has expanded to include friend-to-friend networks and privacy networks such as Tor. The reciprocal term for a darknet is a clearnet or the surface web when referring to content indexable by search engines. The term "darknet" is often used interchangeably with the "dark web" due to the quantity of hidden services on Tor's darknet. The term is often inaccurately used interchangeably with the deep web due to Tor's history as a platform that could not be search-indexed. Mixing uses of both these terms has been described as inaccurate, with some commentators recommending the terms be used in distinct fashions.
Origins
"Darknet" was coined in the 1970s to designate networks isolated from ARPANET, for security purposes. Darknet addresses could receive data from ARPANET but did not appear in the network lists and would not answer pings or other inquiries. The term gained public acceptance following publication of "The Darknet and the Future of Content Distribution", a 2002 paper by Peter Biddle, Paul England, Marcus Peinado, and Bryan Willman, four employees of Microsoft who argued the presence of the darknet was the primary hindrance to the development of workable digital rights management technologies and made copyright infringement inevitable. This paper described "darknet" more generally as any type of parallel network that is encrypted or requires a specific protocol to allow a user to connect to it.
All darknets require specific software installed or network configurations made to access them, such as Tor, which can be accessed via a customised browser from Vidalia, or alternatively via a proxy configured to perform the same function.
Active
Tor is the most popular instance of a darknet, often mistakenly equated with darknet in general. illustrating the average number of Tor users per day between August 2012 and July 2013.Alphabetical list:
anoNet is a decentralized friend-to-friend network built using VPN and software BGP routers.
BitTorrent is a high performance semi-pure P2P file sharing protocol.
Decentralized network 42.
Freenet is a popular DHTfile hosting darknet platform. It supports friend-to-friend and opennet modes.
GNUnet can be utilised as a darknet if the "F2F topology" option is enabled.
I2P is an overlay proxy network that features hidden services called "Eepsites".
OneSwarm can be run as a darknet for friend-to-friend file-sharing.
RetroShare is a friend-to-friend messenger communication and file transfer platform. It may be used as a darknet if DHT and Discovery features are disabled.
Riffle is a government, client-server darknet system that simultaneously provides secure anonymity, efficient computation, and minimal bandwidth burden.
Syndie is software used to publish distributed forums over the anonymous networks of I2P, Tor and Freenet.
Tor is an anonymity network that also features a darknet – via its onion services.