Optical time-domain eavesdropping risks of CRT displays

  title={Optical time-domain eavesdropping risks of CRT displays},
  author={Markus G. Kuhn},
  journal={Proceedings 2002 IEEE Symposium on Security and Privacy},
  • M. Kuhn
  • Published 12 May 2002
  • Physics
  • Proceedings 2002 IEEE Symposium on Security and Privacy
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… 

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