Abstract
This paper presents a method for reconstruction of a personal computer (PC) display image from common-mode noises coupling with monitor signals on a PC power cable. While the signal cable, which connects the PC and the monitor, is usually near the user, the power cable is connected to the outside electrical network of the office or the building. Thus, the power cables may become dominant gateways and/or antennas for emission and conduction of the common-mode noise, which may lead to a serious security issue. The measured common-mode was found to include both the monitor signal and undesired beats, which were caused by step responses of the signal and conceal the meaningful information. The original monitor signal was then calculated by excluding the beats, which could be measured by using standard up-step and down-step responses, from the measured common-mode noise and using an inverse function of the noise current level. The experimental results show that the beats were removed almost completely from the noise waveform for a monochromatic image. Alphabetic character strings, each of which were composed of, at most, 9 × 9 dots, were confirmed to be reconstructed clearly both in the monitor resolutions of 800 × 600 pixels and 1280 × 1024 pixels from the common-mode noise.
Highlights
With developments of multimedia telecommunication networks, increased speed of information processing and power saving are required for networks and telecommunication equipment, including personal computers (PCs)
A signal processing algorithm was proposed to reconstruct a PC display image from the common-mode noise emitting on the PC power cable, which was measurable by using the current probe
The complicated beats, which were caused by the up-step and the down-step responses of the signal, concealed the meaningful information included in the common-mode noise
Summary
With developments of multimedia telecommunication networks, increased speed of information processing and power saving are required for networks and telecommunication equipment, including personal computers (PCs). The common-mode noise containing the information displayed on the monitor seems to appear from the signal cable and from the power cable of the monitor. Studies on noise emitting from the power cables of the PC and its applications are important for research that may used in military contribute in increasing thenoise awareness of noise emission andbe conduction, which technology, may lead to but a serious security issue. The organization of small this paper is as follows: Sectionon the presents thefrom measurement system set-up processing to reconstruct size characters displayed monitor common-mode noise on for the common-mode noise of the power line.
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