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GNUnet is a free software framework for decentralized, peer-to-peer networking and an official GNU package. The framework offers link encryption, peer discovery, resource allocation, communication over many transports (such as tcp, udp, http, https, wlan and bluetooth) and various basic peer-to-peer algorithms for routing, multicast and network size estimation. GNUnet's basic network topology is that of a mesh network. GNUnet includes a distributed hash table (DHT) which is a randomized variant of Kademlia that can still efficiently route in small-world networks. GNUnet offers a "F2F topology" option for restricting connections to only the users' trusted friends. The users' friends' own friends (and so on) can then indirectly exchange files with the users' computer, never using its IP address directly. GNUnet uses Uniform resource identifiers (not approved by IANA, although an application has been made). GNUnet URIs consist of two major parts: the module and the module specific identifier. A GNUnet URI is of form ''gnunet://module/identifier'' where ''module'' is the module name and ''identifier'' is a module specific string. The primary codebase is written in C, but with gnunet-java there is an effort to produce an API for developing extensions in Java. GNUnet is part of the GNU project. It has gained interest to the hacker community after the PRISM revelations. GNUnet includes various P2P applications in the main distribution of the framework; additionally, a few external projects (such as secushare) are also extending the GNUnet infrastructure. GNUnet is unrelated to the older Gnutella P2P protocol. Gnutella is not an official GNU project while GNUnet is. == File sharing == The primary application at this point is anonymous, censorship-resistant file-sharing, allowing users to anonymously publish or retrieve information of all kinds. GNUnet uses GNU libextractor to automatically annotate shared files with metadata. The file sharing service uses GNUnet's anonymity protocol for routing queries and replies. Forwarded query messages are used to search for content and blocks of data. Depending on load of the forwarding node, messages are forwarded to zero or more nodes. When a node is under stress it drops requests from its neighbor nodes having lower internal trust value. A special feature of GNUnet's anonymity protocol is that the user can select an individual anonymity level. The anonymity level determines how much cover traffic a peer must have to hide the user's own traffic. Users can specify an anonymity level for each publish, search and download operation. An anonymity level of ''zero'' can be used to select non-anonymous file-sharing. GNUnet's DHT infrastructure is only used if non-anonymous file-sharing is specified. 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「GNUnet」の詳細全文を読む スポンサード リンク
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