2 ms·
Yes, but cryptographic hashes are irrelevant here because they'd allow to easily bypass CSAM by modifying/appending a single byte.
by StrLght 5y ago
Yes, but cryptographic hashes are irrelevant here because they'd allow to easily bypass CSAM by modifying/appending a single byte.
- woofie11 5y agoApple is claiming to have a visual equivalent to a cryptographic hash -- one which won't change with a single byte, but only if the image is substantially different. At least their security analysis relies on that. From their whitepaper: "The threshold is selected to provide an extremely low (1 in 1 trillion) probability of incorrectly flagging a given account" If your claim is that their hash algorithm isn't cryptographic, their security analysis is incorrect.
- kbelder 5y agoTheir security analysis is obviously incorrect. "equivalent to a cryptographic hash" "change... only if the image is substantially different" Both are not true, cannot be true.
- nullc 5y agoIt's trivial to cause a neural hash non-match-- either imperceptibly with a little noise, or by adding an overlay on the image. If you downsample and quantize an image before sha256ing it you get a bit of robustness to accidental false-negatives. While both schemes are trivially bypassable.