“The implementations described here are all in the early stage of development, so none of them provide the strong guarantees promised by the theoretical models. Currently, the advantage is on the side of the attacker. However, once the systems mature, and provided there is sufficient interaction between theory and implementation, real anonymity will be possible in a practical peer-to-peer file-sharing system.” (Chothia-Chatzikokolakis,2005) [pdf] Cf.: http://www.lix.polytechnique.fr/~tomc/P2P/index.html