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In this paper, the authors study the Denial-of-Service (DoS) attack on secondary users in a cognitive radio network by Primary User Emulation (PUE). Most approaches in the literature on Primary User Emulation Attacks (PUEA) discuss mechanisms to deal with the attacks but not analytical models. Simulation studies and results from test beds have been presented but no analytical model relating the various parameters that could cause a PUE attack has been proposed and studied. They propose an analytical approach based on Fenton's approximation and Markov inequality and obtain a lower bound on the probability of a successful PUEA on a secondary user by a set of co-operating malicious users.
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