1. Distributed checksum clearinghouses, http://www.rhyolite.com/dcc
2. Chirita, P., Diederich, J., Nejdl, W.: MailRank: Using Ranking for Spam Detection. In: 14th ACM International Conference on Information and Knowledge Management, pp. 373–380. ACM, Bremen (2005)
3. Damiani, E., Vimercati, S.D.C.D., Paraboschi, S., Samarati, P.: P2P-Based Collaborative Spam Detection and Filtering. Peer-to-Peer Computing, pp. 176–183 (2004)
4. Douceur, J.R.: In: Druschel, P., Kaashoek, M.F., Rowstron, A.I.T. (eds.) The Sybil Attack: Revised Papers from the First International Workshop on Peer-to-Peer Systems, pp. 251–260. Springer, London (2002)
5. Duma, C., Karresand, M., Shahmehri, N., Caronni, G.: A Trust-Aware, P2P-Based Overlay for Intrusion Detection. In: 17th International Workshop on Database and Expert Systems Applications, pp. 692–697. Krakow, Poland (2006)