针对认知无线电网络中路由受到的选择性转发攻击，提出一种基于信任的安全路由模型。通过监视节点的数据转发行为，构建节点的信任以识别恶意节点。基于路由选择必须同频谱分配紧密结合的特点，在路由发现阶段，请求信息中封装节点的可用频谱机会并避免发送给恶意节点。在路由选择阶段，利用节点信任构建可用路径信任，结合延时度量进行路由决定。同时，根据节点的信任划分对其服务请求采取不同的响应，对非可信节点的恶意行为采取更严厉的惩罚，从而激励节点在路由中的合作。仿真结果及分析表明，在选择性转发攻击下，该模型较已有模型在网络吞吐率、端到端延迟方面都有较好的表现。%A trust-based secure routing model was put forward for defending against the selective forwarding attack on routing in cognitive radio networks. Based on monitoring results of nodes' forwarding behavior, trusts were built in order to identify malicious nodes. For the characteristic that routing selection must be closely collaborative with spectrum allo-cation, a route request piggybacking available spectrum opportunities was sent to non-malicious nodes during the routing discovery phase, and routing decisions were performed according to delays and available paths' trusts calculated from nodes' trusts during the routing selection phase. At the same time, different responses were made to service requests from nodes in different trust levels, and more severe penalties were taken for malicious behavior from non-trusted nodes, which can promote nodes’ cooperation in routing. Simulation results and analysis show that under selective forwarding attack the proposed model has advantages in network throughput and end-to-end delay over the existing models.
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