There have been studies on the TEM coaxial transmission line which consists of two conductors belonging to two different families of cylindrical surfaces. We will take up the unscreened slab line, which, besides the e...There have been studies on the TEM coaxial transmission line which consists of two conductors belonging to two different families of cylindrical surfaces. We will take up the unscreened slab line, which, besides the extensive applications in microwave filter technology, may be used as an accurate primary standard of characteristic impedance. Fig. 4. 2 of [7] shows that if the side walls are removed effectively to infinity, the unshielded structure at pres-展开更多
The display image of a PC can be reconstructed by using the conducted emission on the PC＇s network cable. The relevant signals which be used to reconstruct the original image are coupling from the radiation of the sw...The display image of a PC can be reconstructed by using the conducted emission on the PC＇s network cable. The relevant signals which be used to reconstruct the original image are coupling from the radiation of the switching of red, green, blue （RGB） signals in PC. These pertinent signals are partly contained in the frequency region higher than 30 MHz in the conducted emission. From these findings, the near-field coupling principle from PC to the network cable is analyzed firstly. And then, a multi-conductor transmission model for the RGB signals which transmit in the network cable is proposed. In addition, the maximum safe distance is estimated by using this model. In order to check the validity of the estimating distance, the eavesdropping experiment is carried out to reconstruct the original display image. The results demonstrate that the blurred display image can be retrieved at the place of 29.5 m.展开更多
文摘There have been studies on the TEM coaxial transmission line which consists of two conductors belonging to two different families of cylindrical surfaces. We will take up the unscreened slab line, which, besides the extensive applications in microwave filter technology, may be used as an accurate primary standard of characteristic impedance. Fig. 4. 2 of [7] shows that if the side walls are removed effectively to infinity, the unshielded structure at pres-
基金supported by the National Natural Science Foundation of China (61072136, 61171051)
文摘The display image of a PC can be reconstructed by using the conducted emission on the PC＇s network cable. The relevant signals which be used to reconstruct the original image are coupling from the radiation of the switching of red, green, blue （RGB） signals in PC. These pertinent signals are partly contained in the frequency region higher than 30 MHz in the conducted emission. From these findings, the near-field coupling principle from PC to the network cable is analyzed firstly. And then, a multi-conductor transmission model for the RGB signals which transmit in the network cable is proposed. In addition, the maximum safe distance is estimated by using this model. In order to check the validity of the estimating distance, the eavesdropping experiment is carried out to reconstruct the original display image. The results demonstrate that the blurred display image can be retrieved at the place of 29.5 m.
