Angle brackets are traditionally used for actual quotes.
> Step one, break cryptographically secure hashing system
These "perceptual hashes" are not (and cannot be) cryptographically secure, and practical collision attacks have been tested and published. Did you actually read the main article at all?
I don't think I'm even going to bother with the rest.
PhotoDNA doesn't use CS hashes, but others I've looked at do use them. But you're right, you probably don't wanna respond to my parody of you suggestion to trade in CSAM...
You're saying that there are cryptographically-secure PhotoDNA-like hash algorithms? That's remarkable, if true, though I'm not sure if the schemes you're referring to are resistant to preimage recovery or hash collision (different things!)
I dont want to oversell it, having really only seen what I might consider marketing material... I'm pretty sure they're only using a CS hash for the database, where the photo hash is similar to photodna, and they're only adding some indirection.
My assumption was something like sha_something(photodna(image))
> Step one, break cryptographically secure hashing system
These "perceptual hashes" are not (and cannot be) cryptographically secure, and practical collision attacks have been tested and published. Did you actually read the main article at all?
I don't think I'm even going to bother with the rest.