本文選題：電磁信息安全 + TEMPEST�。� 參考：《電波科學(xué)學(xué)報》2014年04期

【摘要】：計算機鍵盤在正常工作時會伴隨產(chǎn)生電磁騷擾噪聲,未授權(quán)人員若竊取這些電磁噪聲經(jīng)分析處理便可還原鍵盤的按鍵信息.經(jīng)測試發(fā)現(xiàn)鍵盤的電磁輻射主要來自鍵盤內(nèi)的印制電路板(Printed Circuit Board,PCB)及接口電纜互連結(jié)構(gòu),在連接處產(chǎn)生共模電壓源并激勵PCB板和接口電纜構(gòu)成的共模回路向外發(fā)射電磁波.通過建立理論模型,分析了鍵盤產(chǎn)生伴隨電磁輻射的機理,并基于該模型對PCB板-電纜互連結(jié)構(gòu)進行了定量計算及電磁全波仿真.用實驗的方法在近場截獲了鍵盤的按鍵信息.實驗結(jié)果表明:計算機鍵盤伴隨產(chǎn)生的電磁騷擾噪聲中含有按鍵信息并可在近場被截獲.
[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.
【作者單位】： 北京郵電大學(xué)電子工程學(xué)院;
【基金】：國家自然科學(xué)基金(No.61072136,61171051)
【分類號】：TP334.23
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本文編號：1779122