1Ripple-Stream: Safeguarding P2P Streaming Against DoS Attacks

Abstract Compared with le-sharing and distributed hash table (DHT) network, P2P streaming is more vul-nerable to denial of service (DoS) attacks because of its high bandwidth demand and stringent time requirement. This paper studies the design of DoS resilient stream-ing networks using credit systems. We propose a novel frameworkripple-streamto improve DoS resilience of P2P streaming. Ripple-stream leverages existing credit sys-tems to introduce credit constraints in overlay construction such that malicious nodes are pushed to the fringe of over-lay networks. Combining credit constraints with overlay optimization techniques, ripple-stream can achieve both DoS resilience and overlay efciency. Our evaluations show that ripple-stream can effectively reduce the convergence time of overlays under attacks and signicantly improve the average receiving data rate of the participating peers. I