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This chapter documents the GNUnet file-sharing application. The original file-sharing implementation for GNUnet was designed to provide anonymous file-sharing. However, over time, we have also added support for non-anonymous file-sharing (which can provide better performance). Anonymous and non-anonymous file-sharing are quite integrated in GNUnet and, except for routing, share most of the concepts and implementation. There are three primary file-sharing operations: publishing, searching and downloading. For each of these operations, the user specifies an anonymity level. If both the publisher and the searcher/downloader specify "no anonymity", non-anonymous file-sharing is used. If either user specifies some desired degree of anonymity, anonymous file-sharing will be used.

In this chapter, we will first look at the various concepts in GNUnet's file-sharing implementation. Then, we will discuss specifics as to how they impact users that publish, search or download files.