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Grid is an emerging technology that aims at utilizing resources efficiently and effectively. A three-tier architecture consisting of Service Providers, Brokers and Regional Resource Administrators is proposed. Consumers submit service requests and policy constraints to the RRA. Each entity has a trust value associated with them which is computed based on their behavior. The three-tier architecture ensures trustworthy resource selection in a grid environment. This architecture is secured by building a mechanism to detect and counter Distributed Denial of Service (DDoS) Attacks. The DDoS defense consists of sensory registers that capture and analyze the traffic characteristics, short-term memory for local detection of DDoS attacks and a long-term memory for collaboration.
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