Cognitive radio is a promising technology aiming to improve the utilization of the radio electromagnetic spectrum. A cognitive
radio is a smart device which runs radio applications software to perform signal processing. The use of this software enables the
device to sense and understand its environment and actively change itsmode of operation based on its observations. Unfortunately,
this solution entails new security challenges. In this paper, we present a cross-layer attack to TCP connections in cognitive radio
networks, analyze its impact on TCP throughput via analytical model and simulation, and propose potential countermeasures to
CitacióHernández, J.; León, O.; Soriano, M. Modeling the lion attack in cognitive radio networks. "Eurasip journal on wireless communication and networking", 2011, vol. 2011, p. 1-10.