智能电网中基于密钥生成的物理层安全技术研究

Research on key generation based physical layer security technology for smart grid

电网作为国家重要基础设施,其安全性至关重要。无线通信在智能电网的发展中体现了重要作用,是实现智能电网泛在环境感知、嵌入式计算、网络通信等系统工程的重要保障。然而,在突破传统物理连接设备限制的同时,无线电磁传播的开放性也给智能电网带来了严峻的安全挑战。为了确保智能电网无线终端间的通信安全,文中提出了一种基于密钥生成的增强型物理层安全策略。该策略综合利用电网设备的物理标识、无线信道的随机特性以及时间戳功能,既可以实现“一次一密”的轻量级加密效果,又能够有效鉴别合法网络设备,从通信安全和设备识别两个角度为智能电网提供高效可靠的安全通信保障。仿真实验结果表明,文中所提出的物理层密钥生成方法可以充分保障无线通信安全,在实际应用中可以有效对抗窃听者的窃听攻击,同时针对恶意干扰攻击也具有很强的鲁棒性。

Smart grid is a vital national infrastructure,the security of which is of great importance.Wireless communication plays an important role in the development of smart grid,and it is an important guarantee for system engineering such as ubiquitous environment awareness,embedded computing,network communication and network control of smart grid.Nevertheless,the openness of wireless electromagnetic propagation also brings serious severe challenges to smart grid while breaking through the limitations of traditional physical connected devices,In order to ensure the communication security for the wireless terminals of smart grid,an enhanced physical layer security strategy based on key generation is proposed in this paper.The strategy comprehensively utilizes the physical identification of the smart grid equipment,the random characteristics of the wireless channels,and the timestamp function,which can not only realize the“One-Time-Pad”encryption,but can also identify the legitimate network equipment,thus guaranteeing an efficient and reliable secure transmission from the perspectives of communication security and equipment identification.Simulation results show that the proposed security strategy can effectively safeguard the communication security,which can be used not only to degrade the performance of passive wiretapping,but also to maintain high robustness against jamming attacks.