Date Added: Apr 2011
Churn refers the continuous process of node arrival and departure in distributed peer-to-peer network. Enormous nodes joining the system concurrently will results in a flash crowd scenario for special nodes in the system, and enormous nodes crashing in a moment might come out a broken network. In fact, the joining and crashing always occur around some nodes at the same time, which will conduct strong dynamic environment and affect the detailed application over the overlay very much. In P2P networks under churn, the authors divide the new joining nodes into normal freshman, whitewasher and crowd attackers, and divide the departure nodes into normal dying nodes, outcast whitewasher and partition attackers.