Association for Computing Machinery
Peer-To-Peer (P2P) systems have made an enormous impact on the Internet, directly affecting its performance and security. The litigation against P2P le sharing has led some designers to opt for purely decentralized P2P models. The latter have quickly become attractive to Internet users, who often consider pure P2P as more \"Secure\" than hybrid systems (i.e. with some central entity). In this paper, the authors concentrate on some relevant security threats and performance inefficiencies in the Gnutella P2P network, which is worldwide, the most popular fully decentralized sys-tem.