Date Added: Oct 2010
Peer-to-peer systems provide a scalable content distribution environment where each peer contributes with a share of resources in the distributed system. The efficiency of peer-to-peer networks comes from the file segmentation procedure, allowing peers to redistribute small pieces of the original file as soon as they finish downloading them instead of waiting for the complete file download. Moreover, the decentralized fashion of the paradigm with multiple sources makes it scalable and robust under high churn. Due to the popularity of such systems, many attacks such as content pollution arose, targeting the content integrity by inserting bogus data in the network to increase the download time and bandwidth consumption.