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Cyber-criminals use distributed denial-of-service attacks (DDoS) and XML denial-of-service attacks (XDoS) to extort money from online service providers. This kind of attacks is normally targeted at a particular service provider to exhaust the network and system resources of the provider. This paper proposes a scheme for building a defense system against DDoS and XDoS attacks. The system is built on Web Services. It can be constructed and reconfigured easily by an attack victim.