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高级量测体系(AMI)是智能电网的关键组成部分,无线传感器网络(WSNs)在AMI中正发挥着越来越重要的作用。网络安全是保证AMI可靠运行的前提,因此为了保证AMI中WSNs的网络安全,文中提出了一种基于椭圆曲线密码(ECC)的密钥管理方案。该方案根据AMI中信息传输方式的不同分为单播通信密钥管理机制和多播通信密钥管理机制两部分。详细阐述了椭圆曲线的选取、传感器节点中ECC公钥和私钥的求取、单播通信链路密钥和多播通信网络密钥的建立、分发及更新过程。研究结果表明,提出的密钥管理方案具有较好的安全性、较少的存储开销和能耗,能够满足AMI的通信安全需求。
Advanced Measurement Systems (AMIs) are a key part of smart grids and Wireless Sensor Networks (WSNs) are playing an increasingly important role in AMIs. Network security is the premise of guaranteeing the reliable operation of AMI. Therefore, in order to ensure the network security of WSNs in AMI, a key management scheme based on elliptic curve cryptography (ECC) is proposed in this paper. According to the different modes of information transmission in AMI, the scheme is divided into two parts: unicast communication key management mechanism and multicast communication key management mechanism. The selection of elliptic curve, the calculation of ECC public key and private key in sensor node, the establishment, distribution and updating process of unicast communication link key and multicast communication network key are described in detail. The results show that the proposed key management scheme has good security, less storage overhead and energy consumption, and can meet the communication security requirements of AMI.