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 meta data.
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.
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