Investigation of Unintentional Video Emanations From a VGA Connector in the Desktop Computers

This paper focuses on the compromising video emanations from a desktop computer with a liquid-crystal display (LCD). Near-field tests are performed in a common unshielded office environment to investigate the video information leakage, and the tests show that the video graphics adapter (VGA) connect...

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Published inIEEE transactions on electromagnetic compatibility Vol. 59; no. 6; pp. 1826 - 1834
Main Authors Zhang, Nan, Lu, Yinghua, Cui, Qiang, Wang, Yiying
Format Journal Article
LanguageEnglish
Published New York IEEE 01.12.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Adapters
Antennas
Compromising emanations
Computational modeling
Computer simulation
Computers
Emission
Field tests
Leakage
Liquid crystal displays
liquid-crystal display (LCD) computer
Personal computers
Pins
TEMPEST
video signals
Wire
wire antenna model
Wires
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Abstract This paper focuses on the compromising video emanations from a desktop computer with a liquid-crystal display (LCD). Near-field tests are performed in a common unshielded office environment to investigate the video information leakage, and the tests show that the video graphics adapter (VGA) connector is a leaking source. To illustrate the mechanism of the video leakage, a wire antenna model is developed according to the physical dimensions of the connector. The radiated fields of the connector are calculated in the time domain from this model, the results are verified by the tests. Combining the expressions of the radiated fields and the transfer function of the test probe, the function relationship between the original red/green/blue signal and the intercepted signal is established. Finally, a readable text is reconstructed from the intercepted signal when a Chinese document is displayed on the LCD.
AbstractList This paper focuses on the compromising video emanations from a desktop computer with a liquid-crystal display (LCD). Near-field tests are performed in a common unshielded office environment to investigate the video information leakage, and the tests show that the video graphics adapter (VGA) connector is a leaking source. To illustrate the mechanism of the video leakage, a wire antenna model is developed according to the physical dimensions of the connector. The radiated fields of the connector are calculated in the time domain from this model, the results are verified by the tests. Combining the expressions of the radiated fields and the transfer function of the test probe, the function relationship between the original red/green/blue signal and the intercepted signal is established. Finally, a readable text is reconstructed from the intercepted signal when a Chinese document is displayed on the LCD.
Author Yiying Wang
Yinghua Lu
Qiang Cui
Nan Zhang
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Snippet This paper focuses on the compromising video emanations from a desktop computer with a liquid-crystal display (LCD). Near-field tests are performed in a common...
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SubjectTerms Adapters
Antennas
Compromising emanations
Computational modeling
Computer simulation
Computers
Emission
Field tests
Leakage
Liquid crystal displays
liquid-crystal display (LCD) computer
Personal computers
Pins
TEMPEST
video signals
Wire
wire antenna model
Wires
Title Investigation of Unintentional Video Emanations From a VGA Connector in the Desktop Computers
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Volume 59
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