Optical time-domain eavesdropping risks of CRT displays
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| Venue: | In Proc. of the IEEE Symp. on Security and Privacy |
| Citations: | 34 - 2 self |
BibTeX
@INPROCEEDINGS{Kuhn_opticaltime-domain,
author = {Markus G. Kuhn},
title = {Optical time-domain eavesdropping risks of CRT displays},
booktitle = {In Proc. of the IEEE Symp. on Security and Privacy},
year = {}
}
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Abstract
A new eavesdropping technique can be used to read cathode-ray tube (CRT) displays at a distance. The intensity of the light emitted by a raster-scan screen as a function of time corresponds to the video signal convolved with the impulse response of the phosphors. Experiments with a typical personal computer color monitor show that enough high-frequency content remains in the emitted light to permit the reconstruction of readable text by deconvolving the signal received with a fast photosensor. These optical compromising emanations can be received even after diffuse reflection from a wall. Shot noise from background light is the critical performance factor. In a sufficiently dark environment and with a large enough sensor aperture, practically significant reception distances are possible. This information security risk should be considered in applications with high confidentiality requirements, especially in those that already require “TEMPEST”-shielded equipment designed to minimize radio-frequency emission-security concerns. 1.
