研究目的
Analyzing the possibility of information leakage from DVI cable for color display and studying the legibility of recovered images based on different color combinations.
研究成果
The paper concludes that information can be recovered from EM emanations of DVI cable for color displays, with legibility varying based on color combinations. In some cases, unrecognizable target displays can yield recognizable recovered images, highlighting a security risk. This can inform display design to mitigate EM leakage while maintaining visibility.
研究不足
The study is limited to specific color combinations and a fixed experimental setup (e.g., distance of 5 cm, resolution 1280×1024 at 60 Hz). It does not explore variations in environmental conditions or other display parameters. The equipment used is not detailed, which may affect reproducibility.
1：Experimental Design and Method Selection:
The study builds on previous work on EM emanations from DVI cable with gray scale display, extending it to color displays. It involves measuring EM emanations using a near-field magnetic probe at a distance of 5 cm, with specific color combinations defined in hexadecimal values for RGB channels. The methodology includes analyzing the characteristics of DVI and TMDS encoding, and comparing recovered images to target images for legibility.
2：Sample Selection and Data Sources:
Three cases of color display are used, with different foreground and background color combinations in RGB channels (e.g., Case 1: foreground 55-00-00, background 55-55-55; Case 2: foreground 00-55-00, background 55-00-00; Case 3: foreground 55-FF-00, background 10-FF-00). The display resolution is 1280×1024 at 60 Hz scan rate, as per VESA standards.
3：0). The display resolution is 1280×1024 at 60 Hz scan rate, as per VESA standards.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Near-field magnetic probe for EM leakage measurement, DVI cable, computer, and monitor. Specific models or brands are not mentioned in the provided text.
4：Experimental Procedures and Operational Workflow:
EM emanations are measured from the DVI cable for each color display case. The signals are recovered to images, and the legibility is analyzed by comparing target and recovered images. The setup is consistent with previous work, using a main leakage frequency of 324 MHz (third harmonic of pixel frequency).
5：Data Analysis Methods:
The analysis involves comparing waveforms of EM leakage and data signals (e.g., for 55(16) and 10(16) colors), and evaluating image legibility based on brightness differences mapped from EM leakage levels.
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