Comment by pseudalopex
4 years ago
We 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.
Agreed, but we don’t know the collision characteristics of this algorithm so knowing this difference is moot in this context.