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Isn't this very very silly? You just need to change one pixel and the hash will be different.
by whitepaint 5y ago
Isn't this very very silly? You just need to change one pixel and the hash will be different.
- deleted 5y ago[deleted]
- krapp 5y agoNo, perceptual hashes don't work that way. It's a comparison of similarity to a target, not just making an MD5 hash of an image. Here's Apple's documentation on it : https://www.apple.com/child-safety/pdf/CSAM_Detection_Technical_Summary.pdf https://www.apple.com/child-safety/pdf/CSAM_Detection_Techni...
- whitepaint 5y agoOh nice, didn't know about this.
- 2OEH8eoCRo0 5y agoVery helpful. Thanks! Will give this a read.
- dosshell 5y agoThats not how it works. The fingerprints/hashes do not need be exactly the same. Just close enough. The fingerprint/hash is designed to not change much if the pictures are similar. Simplified: If you draw a circle and i draw a circle, their fingerprints will be closer then if I would have drawn a rectangle.