Abstract
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.
