键盘按键信息的近场截获研究

发布时间：2018-04-20 19:31

  本文选题：电磁信息安全 + TEMPEST　； 参考：《电波科学学报》2014年04期

【摘要】：计算机键盘在正常工作时会伴随产生电磁骚扰噪声,未授权人员若窃取这些电磁噪声经分析处理便可还原键盘的按键信息.经测试发现键盘的电磁辐射主要来自键盘内的印制电路板(Printed Circuit Board,PCB)及接口电缆互连结构,在连接处产生共模电压源并激励PCB板和接口电缆构成的共模回路向外发射电磁波.通过建立理论模型,分析了键盘产生伴随电磁辐射的机理,并基于该模型对PCB板-电缆互连结构进行了定量计算及电磁全波仿真.用实验的方法在近场截获了键盘的按键信息.实验结果表明:计算机键盘伴随产生的电磁骚扰噪声中含有按键信息并可在近场被截获.
[Abstract]:The computer keyboard will produce electromagnetic disturbance noise when it works normally. If the unauthorized personnel steal the electromagnetic noise, the key information of the keyboard can be restored by analyzing the noise. It is found that the electromagnetic radiation of the keyboard mainly comes from printed Circuit printed Circuit (PCB) and the interconnect structure of the interface cable. The common mode voltage source is generated at the connection and the common-mode circuit composed of the PCB board and the interface cable is excited to emit electromagnetic waves outwards. Through the establishment of theoretical model, the mechanism of accompanying electromagnetic radiation from keyboard is analyzed. Based on the model, quantitative calculation and electromagnetic full wave simulation of PCB board cable interconnection structure are carried out. The keystroke information of the keyboard is intercepted in the near field by the method of experiment. The experimental results show that the electromagnetic disturbance noise generated by the computer keyboard contains keystroke information and can be intercepted in the near field.
【作者单位】： 北京邮电大学电子工程学院;
【基金】：国家自然科学基金(No.61072136,61171051)
【分类号】：TP334.23
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本文编号：1779122