A Trial of the Interception of Display Image Using Emanation of Electromagnetic Wave

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  • TANAKA Hidema
    Information Security Center, National Institute of Information and Communications Technology
  • TAKIZAWA Osamu
    Information Security Center, National Institute of Information and Communications Technology
  • YAMAMURA Akihiro
    Information Security Center, National Institute of Information and Communications Technology

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Other Title
  • 端末からの漏洩電磁波の傍受による表示画面の再現実験
  • タンマツ カラ ノ ロウエイ デンジハ ノ ボウジュ ニ ヨル ヒョウジ ガメン ノ サイゲン ジッケン

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This paper describes the experiments and analysis of the interception of personal computer's display image using emanation of electromagnetic wave. We used personal computers as the targets and experimented on reconstruction of screen information under the following equipments and environments; (1) using a near magnetic field probe, (2) using an antenna from away place, (3) using an injection probe over power supply cable. From the result of (1), we show that the slight difference in the synchronous frequency of video signal among PCs will become the key which recognizes the target. In the experiment (2), we succeeded from about 4 meters away place with frequency which is inside of VCCI regulations. In the experiment (3), we succeeded the interception from about 30 meters away place, and we found that the result depends on position relation between a probe and AC adapter.<br>

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