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New application layer DDoS attacks is a continuous critical threat to which network layer solutions is not applicable as attackers are indistinguishable based on packets or protocols. The increase in Internet-based transactions and communications offers new opportunities for hackers to disrupt business operations with DDoS attacks to prevent legitimate users from accessing services. In this paper, the authors propose Trust Management Helmet (TMH) as a partial solution to this problem, which is a lightweight mitigation mechanism that uses trust to differentiate legitimate users and attackers. Its key insight is that to protecting the connectivity of good users during application layer DDoS attacks, evaluation is based on their visiting history, and used to schedule the service to their requests.
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