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A darknet (or dark net) is an overlay network that can only be accessed with specific software, configurations, or authorization, often using non-standard communications protocols and ports. Two typical darknet types are friend-to-friend networks (usually used for file sharing with a peer-to-peer connection) and anonymity networks such as Tor via an anonymized series of connections. The reciprocal term for an encrypted darknet is clearnet〔 〕〔 〕 or surface web when referring to search engine indexable content. ==Origins== Originally coined in the 1970s to designate networks which were isolated from ARPANET (which evolved into the Internet) for security purposes, darknets were able to receive data from ARPANET but had addresses which 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 that the presence of the darknet was the primary hindrance to the development of workable DRM technologies and inevitability of copyright infringement. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「darknet」の詳細全文を読む スポンサード リンク
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