[HN Gopher] Inverting PhotoDNA
       ___________________________________________________________________
        
       Inverting PhotoDNA
        
       Author : anishathalye
       Score  : 13 points
       Date   : 2021-12-20 16:46 UTC (6 hours ago)
        
 (HTM) web link (www.anishathalye.com)
 (TXT) w3m dump (www.anishathalye.com)
        
       | anishathalye wrote:
       | A bit of context: Microsoft developed PhotoDNA to identify
       | illegal images like CSAM -- NCMEC maintains a database of
       | PhotoDNA signatures, and many companies use this service to
       | identify and remove these images.
       | 
       | Microsoft claims:
       | 
       | > A PhotoDNA hash is not reversible, and therefore cannot be used
       | to recreate an image.
       | 
       | This project shows that this isn't quite true: machine learning
       | can do a pretty good job of reproducing a thumbnail-quality
       | images from a PhotoDNA signature.
       | 
       | There has been some discussion in the past on HN about PhotoDNA:
       | https://news.ycombinator.com/item?id=28378254. It has been
       | claimed that PhotoDNA is reversible, but there was no public
       | demonstration as far as I know.
        
       ___________________________________________________________________
       (page generated 2021-12-20 23:02 UTC)