In this paper, wireless sensor network (WSN) security issue in the presence of an eavesdropper is analysed. The sensor-sink as well as sensor-eavesdropper channels are assumed to be subjected to generalized-K fading. According to the physical layer security framework, we employ round-robin, optimal sensor and cumulative distribution function-based scheduling scheme to enhance secure connection between sensor nodes and to attain low probability of intercept. Novel analytical results are given in a form of easy-to-compute analytical expressions for the intercept probability. Additionally, asymptotic closed-form expressions are derived and diversity orders of scheduling schemes are determined. Numerical results demonstrate important impacts of fading and shadowing parameters of main and wiretap links, network size and selected scheme on WSN security. Presented results are validated by independent Monte Carlo simulations.

本文分析了存在窃听者的无线传感器网络（WSN）的安全性问题。假定传感器接收器通道和传感器监听器通道均受到广义K衰退。根据物理层安全框架，我们采用循环调度，最佳传感器和基于累积分布函数的调度方案来增强传感器节点之间的安全连接并降低拦截的可能性。新颖的分析结果以易于计算的截距概率分析表达式形式给出。另外，得出渐近闭式表达式并确定调度方案的分集阶数。数值结果表明，主干和窃听链路的衰落和阴影参数，网络大小和所选方案对WSN安全性具有重要影响。提出的结果通过独立的蒙特卡洛模拟验证。