document: Protecting electronic commerce from distributed denial-of-service attacks It is widely recognized that distributed denial-of-service ( DDoS ) attacks can disrupt electronic commerce and cause large revenue losses . However , effective defenses continue to be mostly unavailable . We describe and evaluate VIPnet , a novel value-added network service for protecting e-commerce and other transaction-based sites from DDoS attacks . In VIPnet , e-merchants pay Internet Service Providers ( ISPs ) to carry the packets of the e-merchants ' best clients ( called VIPs ) in a privileged class of service ( CoS ) , protected from congestion , whether malicious or not , in the regular CoS. . VIPnet rewards VIPs with not only better quality of service , but also greater availability . Because VIP rights are client - and server-specific , can not be forged , are usage-limited , and are only replenished after successful client transactions ( e.g. , purchases ) , it is impractical for attackers to mount and sustain DDoS attacks against an e-merchant 's VIPs . VIPnet can be deployed incrementally and does not require universal adoption . Experiments demonstrate VIPnet 's benefits .
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