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But the cops have far more advanced tools. . .

Posted by Will Robinson on 2017-April-26 13:31:47, Wednesday
In reply to Re: Does pixellating make illegal photos legal??? posted by Brise on 2017-April-26 10:09:08, Wednesday
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So to do the job, the entire contents of a suspect's hard drive are dumped into a massive log file in the widely-used forensic examination tool EnCase. LTU's Image-Seeker can function as a plug-in for EnCase, and it scans the log file for images. Once these are identified, the software generates "image DNA" for each picture. The DNA is a unique identifier that is based on a pixel-level examination of color, shapes, textures, object arrangement, and other elements. The result is a unique identifier that is far more robust than a simple file hash (which can be fooled by making just tiny tweaks to an image).
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And this article is from 10 years ago, so I'm sure the technology has progressed even further.

  • (https site) https://arstechnica.com/business/2007/09/finding-child-porn-without-hashes-or-keywords/
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