信息安全设备电磁屏蔽结构设计理论和方法研究

The electromagnetic radiation of information security equipment is an important way of secret information leakage, so the shielding effectiveness of the equipment is required to an extremely high level in TEMPEST. However, there is no corresponding theory and method to support the design of the equipment. In this project, some important issues will be studied intensively, including feature recognition and modeling of internal near field radiation with red signals, the exciting mechanism and suppressing approaches of electromagnetic resonance, the principle and structure for electromagnetic sealing of slots, the ventilation structure based on wave guide theory, and the radiation modeling and shielding theory of cables. Through these studies, we hope to understand the mechanism of electromagnetic leakage of information security equipment, create the modeling and simulation method for electromagnetic shielding effectiveness, conclude the influence of mechanical structure on electromagnetic shielding properties, propose some new mechanical structure with high shielding effectiveness, and finally, establish the design theory and method of electromagnetic shielding for information security equipment. This project involves the cross between mechanical structure and electromagnetic property intensively, the studies include from the source to all the channels of electromagnetic radiation, so that the electromagnetic shielding design can be conducted at system level. The object of this project meets the information security development strategy of China, and its achievements can increase the mechanical design content, expand machine design technique, and have broad applications in many fields such as military affairs, computer engineering, communication, E-government, E-commerce, and E-finance.

电磁辐射是信息安全设备涉密信息泄漏的重要途径，TEMPEST标准对设备电磁屏蔽性能提出了极高要求，现有基于EMC的电磁屏蔽设计方法尚无法支撑信息安全设备的设计。项目拟通过载有红信号的近场辐射源特征及建模方法、机械结构电磁谐振机理及抑制方法、缝隙电磁密封原理及结构、波导通风结构、线缆辐射特性及屏蔽结构等内容研究，了解电磁泄漏机理，建立屏蔽特性建模与计算方法，掌握结构因素对屏蔽特性的影响规律，提出高屏蔽效能的新型结构，形成基于电磁学理论的机械结构电磁屏蔽设计方法。项目研究“结构”因素与“电磁”特性的关系，涉及机械设计学与电磁学的交叉和“机械-电磁”特性的耦合。内容涵盖电磁辐射从“源”到“路”的各种通道，能从系统角度解决设备整机的电磁屏蔽问题。研究目标符合国家信息安全发展战略，研究成果可丰富机械设计内涵，拓展机械设计方法，在军事、电子、通讯及电子政务、商务、金融等领域具有广阔应用前景。

电磁辐射是信息安全设备信息泄漏的重要途径，TEMPEST标准对其电磁屏蔽性能提出了极高要求。项目对设备各种电磁泄漏通道的辐射机理、特性和计算方法进行了研究，以期能对各种辐射进行有效抑制，提高信息安全性。已开展的研究内容包括：空间任意弯曲线缆、线束的电磁辐射特性、计算和抑制方法；多芯线缆等效缩减建模方法；线束串扰原理、计算与抑制方法；屏蔽线缆辐射特性、影响因素及其影响规律；PCB近场辐射特性及等效建模方法；腔体电磁谐振特性及计算、抑制方法；腔体电磁密封结构与屏蔽特性；新型高屏效通风散热波导结构等。项目从理论上分析了信息安全设备各种电磁泄漏通道的辐射原理，建立了电磁辐射的计算和预测方法，揭示了各种结构因素对电磁辐射的影响规律，可为设备电磁辐射预测和抑制提供有效途径，为设备电磁屏蔽设计提供理论支撑和方法指导。项目发表论文10篇（另录用2篇），参加国际学术会议4人次，授权及申请发明专利5项。培养毕业博士研究生3名，硕士研究生8名。