Accountable File Indexing Against DDoS Attacks in Peer-to-Peer Networks

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Executive Summary

Peer-To-Peer (P2P) networks are vulnerable from malicious attacks by anonymous users. By populating unprotected peers with poisoned file indices, the attacker can launch a poisoning DDoS (Distributed Denial-of-Service) attacks on any host in the network. The authors solve this security problem with identity-based signatures contained in file indexes to establish peer accountability. They prove that index accountability can effectively block index-poisoning DDoS attacks in any open P2P environment. A new Accountable Indexing Protocol (AIP) is proposed to enforce peer accountability. This protocol is applicable to all P2P file-sharing networks, either structured or unstructured. The system allows gradual transition of peers to become AIP-enabled. They develop an analytical model to characterize the poison propagation patterns.

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