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Protection against Denial of Service (DoS) attacks is a challenging and ongoing problem. Current overlay-based solutions can transparently filter unauthorized traffic based on user authentication. Such solutions require either pre-established trust or explicit user interaction to operate, which can be circumvented by determined attackers and is not always feasible (e.g., when user interaction is impossible or undesirable). The authors propose a Multi-layer Overlay Network (MON) architecture that does not depend on user authentication, but instead utilizes two mechanisms to provide DoS resistant to any IP-based service, and operates on top of the existing network infrastructure.
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