Wireless sensor networks include a large number of sensor nodes which are developed in an environment. These networks have military, commercial, industrial, and medical applications. Providing these networks with security is of absolute importance. One strategy for maintaining the security of these networks is key management. In the presented paper, we propose a smart dynamic key management system for wireless sensor networks which utilizes fuzzy logic for path key generation and for adding new nodes to the network. Our proposed key management system falls in the category of methods which are based on hierarchical networks and it utilizes both pre-distribution and post-deployment mechanisms of key distribution among the sensor nodes. Utilization of fuzzy logic in the proposed key management system results in increased accuracy in decision making and contributes to its smartification. As a result, energy consumption in the network is reduced and the network lifetime is enhanced. Simulation results show that our system, compared to other key management systems, is more efficient in terms of communication overload, required memory space, and energy consumption. Furthermore, our system demonstrated proper resilience and resistance to cryptanalysis attacks.

无线传感器网络包括在环境中开发的大量传感器节点。这些网络具有军事，商业，工业和医疗应用。为这些网络提供安全至关重要。维护这些网络安全性的一种策略是密钥管理。在本文中，我们提出了一种用于无线传感器网络的智能动态密钥管理系统，该系统利用模糊逻辑来生成路径密钥并向网络添加新节点。我们提出的密钥管理系统属于基于分层网络的方法类别，它利用了传感器节点之间密钥分发的预分配和部署后机制。在提出的密钥管理系统中使用模糊逻辑可以提高决策的准确性，并有助于其智能化。结果，减少了网络中的能量消耗并且延长了网络寿命。仿真结果表明，与其他密钥管理系统相比，我们的系统在通信过载，所需的内存空间和能源消耗方面效率更高。此外，我们的系统表现出适当的弹性和抵抗密码分析攻击的能力。