GNUnet

From Free net encyclopedia

Template:Infobox Software GNUnet is a framework for decentralized, peer-to-peer networking. The framework offers link-level encryption, peer discovery and resource allocation. GNUnet was first published November 6, 2001.

The primary codebase is written in C, but with Freeway there is an effort to produce a compatible version written in Java. GNUnet currently runs on GNU/Linux, BSD, Mac OS X, Solaris and Windows.

It is an official part of the GNU operating system.

Contents 1 Services running on GNUnet 1.1 File sharing 2 URIs 2.1 The ECRS module 2.1.1 Examples 3 See also 4 External links

Services running on GNUnet

Image:GNUnet afs logo.png

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.

The file sharing service uses GNUnet's anonymity protocol, GAP, 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 0 or more nodes. When a node is under stress it drops requests from its neighbour nodes having lower internal trust value.

URIs

GNUnet uses Uniform Resource Identifiers not yet approved by IANA. The URI notation has changed along with new GNUnet versions. The following notation is used since version 0.7.0.

The 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 ECRS module

Files shared with GNUnet are ECRS (An Encoding for Censorship-Resistant Sharing) coded. The ecrs module identifier consists of either chk, sks, ksk or loc followed by a slash and a category specific value.

• chk identifies files, typically: gnunet://ecrs/chk/[file hash, using 0-9A-V].[query hash, using 0-9A-V].[file size in bytes]
• sks identifies files within namespaces, typically: gnunet://ecrs/sks/NAMESPACE/IDENTIFIER
• ksk identifies search queries, typically: gnunet://ecrs/ksk/KEYWORD[+KEYWORD]*
• loc identifies a datum on a specific machine, typically: gnunet://ecrs/loc/PEER/QUERY.TYPE.KEY.SIZE

Examples

A type of GNUnet filesharing URI pointing to a specific copy of GNU GPL license text:

gnunet://ecrs/chk/9E4MDN4VULE8KJG6U1C8FKH5HA8C5CHSJTILRTTPGK8MJ6VHORERHE68JU8Q0FDTOH1DGLUJ3NLE99N0ML0N9PIBAGKG7MNPBTT6UKG.1I823C58O3LKS24LLI9KB384LH82LGF9GUQRJHACCUINSCQH36SI4NF88CMAET3T3BHI93D4S0M5CC6MVDL1K8GFKVBN69Q6T307U6O.17992

Another type of GNUnet filesharing URI, pointing to the search results of a search with keyword "gpl":

gnunet://ecrs/ksk/gpl

See also

• Anonymous P2P
• Friend-to-friend networks or F2F
• Tor (anonymity network)
• Freenet

External links

• Official GNUnet homepage at GNU
• GNUnet community homepage & forum
• GNUnet development homepage
• Freeway homepage
• A comparison of GNUnet with other peer-to-peer networking
• A mixed language discussion forum for GNUnet users and developers
• GNUnet FAQ
• GNUnet ECRS/CHK hash generating utility

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