Technique gets clear images from light reflected off blank paper

Technique gets clear images from light reflected off blank paper(arstechnica.com)

34 points by acro 13 years ago | 8 comments

gantz 13 years ago |

Totally different concept, but this reminds me of the anecdotes my professor would tell us about the possibility of eavesdropping on a monitor (CRT then) based on the light radiation emitted, and not from seeing the actual image itself

Robin_Message 13 years ago | |

You're thinking of Optical Time-Domain Eavesdropping Risks of CRT Displays by Markus G. Kuhn in Proceedings of the 2002 IEEE Symposium on Security and Privacy, Berkeley, California, 12–15 May 2002.

Available here: http://www.cl.cam.ac.uk/~mgk25/ieee02-optical.pdf

Pretty amazing that this actually works, just using a high-speed photo-sensor – and doesn't even require line of sight, a reflection off a wall is enough. Unfortunately, I don't think it will work on LCD screens.

snippyhollow 13 years ago | |

Maybe he was talking about project TEMPEST https://en.wikipedia.org/wiki/TEMPEST

artmageddon 13 years ago | |

I don't have a link to the paper, but I recall reading a whitepaper about it as far back as 2002.

yummybear 13 years ago |

Article describing novel way to produce images, yet no images produced in article.

Further investigation finds a few thumbnails an a paywall.

mileswu 13 years ago | |

I grabbed the images from the PDF paper and put them here:

Figure 1: http://i.imgur.com/imfvc.png Figure 2: http://i.imgur.com/xKIOv.png Figure 3: http://i.imgur.com/GevEd.png

vilya 13 years ago |

Interesting stuff!

There's also an article about it on Petapixel: http://www.petapixel.com/2012/07/16/researchers-develop-came...

and the full academic paper is available here: http://arxiv.org/pdf/1202.2078.pdf

nobody_nowhere 13 years ago |

At last! Something that comes close to explaining the "seeing around a corner in a scanned picture" scene in Blade Runner...