In the paper a multilevel intellectual approach to HTTP-requests legitimacy validation is proposed. The approach is devised for HTTP-flood DDoS-attacks detection and prevention in telecommunication networks with a web-server as the target attack object. The analysis of HTTP-requests attributes and their signatures is provided. On the basis of the analysis the attributes are separated into several levels that allow us to design a flow analyzer in a form of the multilevel block. Due to a multilevel structure of the flow analyzer a minimization of resources, spent for a request handling, is achieved.

 Наукова періодика України 

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