3 ms·
It’s been a long time since I had to implement PhotoDNA (helped write a PHP native version of the PhotoDNA hash function at Tumblr), can you indicate if pHash c
by jsjohnst 7y ago
It’s been a long time since I had to implement PhotoDNA (helped write a PHP native version of the PhotoDNA hash function at Tumblr), can you indicate if pHash creates compatible hashes to PhotoDNA’s output?
- faustomorales 7y agoCool (re: writing a PHP version)! Generally speaking, hashes from different hash algorithms cannot be used with each other. By the way, would be glad to connect and chat, especially if you have any thoughts on pain points associated with perceptual hashing (email in profile).
- jsjohnst 7y ago> hashes from different hash algorithms cannot be used with each other That’s what I thought, but your mention of pHash alluded to it maybe being an open source drop in replacement for PhotoDNA, so I wanted to clarify instead of assuming.
- jsjohnst 7y agoDoes NCMEC support collection and distribution of hashes for alternative functions these days? Six years ago they only supported PhotoDNA hashes (hence why we ported Microsoft’s version of the hash function). My email is in my profile too, feel free to reach out if I forget.