3 ms·
That sounds like we know it’s perceptual but not what kind, and therefore we don’t know the collision characteristics.
by zepto 5y ago
That sounds like we know it’s perceptual but not what kind, and therefore we don’t know the collision characteristics.
- pseudalopex 5y agoWe know perceptual hashing and cryptography have incompatible requirements. Think of an image, the same image with 1 pixel changed, and a very different image. A perceptual hash should say 1 and 2 were related and not 3. Cryptographers call that failing a chosen plaintext attack.
- zepto 5y agoAgreed, but we don’t know the collision characteristics of this algorithm so knowing this difference is moot in this context.