Friend-to-friend

Short description: Type of peer-to-peer network in which users only make direct connections with people they know

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A friend-to-friend (or F2F) computer network is a type of peer-to-peer network in which users only make direct connections with people they know. Passwords or digital signatures can be used for authentication.

Unlike other kinds of private P2P, users in a friend-to-friend network cannot find out who else is participating beyond their own circle of friends, so F2F networks can grow in size without compromising their users' anonymity. Retroshare, WASTE, GNUnet, Freenet and OneSwarm are examples of software that can be used to build F2F networks, though RetroShare is the only one of these configured for friend-to-friend operation by default.

Many F2F networks support indirect anonymous or pseudonymous communication between users who do not know or trust one another. For example, a node in a friend-to-friend overlay can automatically forward a file (or a request for a file) anonymously between two friends, without telling either of them the other's name or IP address. These friends can in turn automatically forward the same file (or request) to their own friends, and so on.

Dan Bricklin coined the term "friend-to-friend network" in 2000.[1]

## Contents

* 1 Potential applications of F2F
* 2 See also
* 3 References
* 4 External links

## Potential applications of F2F

* The Bouillon project uses a friend-to-friend network to assign trust ratings to messages.[2]

## See also

* Darknet
* LAN messenger
* Private peer-to-peer
* Web of trust

## References

* B.C. Popescu, B. Crispo, and A.S. Tanenbaum. "Safe and Private Data Sharing with Turtle: Friends Team-Up and Beat the System." In 12th International Workshop on Security Protocols, Cambridge, UK, April 2004.
* T. Chothia and K. Chatzikokolakis. "A Survey of Anonymous Peer-to-Peer File-Sharing." In Proceedings of the IFIP International Symposium on Network-Centric Ubiquitous Systems (NCUS 2005), Nagasaki, Japan, volume 3823 of Lecture Notes in Computer Science, pages 744–755. Springer, 2005.
* J. Li and F. Dabek. "F2F: Reliable Storage in Open Networks." In 5th International Workshop on Peer-to-Peer Systems (IPTPS '06), Santa Barbara, CA, USA, February 2006.
* M. Rogers and S. Bhatti. "How to Disappear Completely: A Survey of Private Peer-to-Peer Networks." In 1st International Workshop on Sustaining Privacy in Collaborative Environments (SPACE 2007), Moncton, NB, Canada, July 2007.
* Numbered references:

1. ↑ D. Bricklin. Friend-to-friend Networks. August 11, 2000.
2. ↑ Grishchenko, Victor (2007). "Bouillon: A Wiki-Wiki Social Web". in Diekert, Volker (in en). Computer Science – Theory and Applications. Lecture Notes in Computer Science. 4649. Berlin, Heidelberg: Springer. pp. 139–145. doi:10.1007/978-3-540-74510-5_16. ISBN 978-3-540-74510-5.

## External links

* Friend2Friend.net, An XML scripting language for writing F2F software
* Discussion about F2F involving Ian Clarke of Freenet
* F2F page at altruists.org

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