Security

Resource Inflation Threats to Denial of Service Countermeasures

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Executive Summary

Currency-based mechanisms have been proposed as a way to use resource fairness among contenders for a service to thwart Denial of Service (DoS) attacks. Under resource fairness, a server allocates its service to the clients in proportion to their payment of a resource, making the resource serve as a kind of currency. The authors consider the vulnerability of currency-based DoS defense mechanisms to various resource inflation attacks in which an attacker can substantially inflate its possession of the resource at low cost and in a way that may be either difficult or undesirable for a valid client to do.

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