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by woodman
4165 days ago
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Development? The technique has been well known for a long time, I remember hearing about it in the late 90s. It isn't widely used because it isn't practical. Also, your countermeasure doesn't work if there is another reflective surface inside the room. |
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The difference is that these things used to be the domain of major government agencies rather than a hobbyist with a few hundred dollars and a poor sense of privacy.