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中文摘要：
认知无线电网络通过认知用户对无线环境的感知，获得频谱空洞信息，在不干扰主用户的前提下，伺机接入空闲频谱，从而满足更多用户的频谱需求，提高频谱资源的利用率，然而，也带来了前所未有的安全挑战。依托认知环，从数据信道、控制信道和终端设备三方面介绍其安全性所面临的问题，以及现有的解决方案，最后给出认知无线电网络的安全建议。
英文摘要：
Cognitive radio can obtain and access spectrum white holes without interfering primary users by sensing wire-less environment to meet with the more spectrum requirement of users and improve spectrum utilization. However, it also brings new secure challenges that different from traditional wireless networks. Relying cognition cycle, the security is- sues in cognitive radio networks are presented from data channel, control channel and terminal equipment, then the ex-isting defensive measures and propose the secure recommendations of cognitive radio networks are introduced.
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