3 ms·
could you use multiple perceptual hash functions with different salts, so that collisions would be less likely while allowing derivatives to be detected?
by sterlind 5y ago
could you use multiple perceptual hash functions with different salts, so that collisions would be less likely while allowing derivatives to be detected?
- heavyset_go 5y agoThey aren't just matching exact hash hits, but are using a metric like the hamming distance between hashes to determine if one image is the same as , or a derivative of, another. The data structures that allow for efficient lookups rely on that metric, or another metric, for matching.
- tatersolid 5y agoThat reduces to just inventing a “fancier” single hash function. This adds no value or security in cryptography; it just makes things slower. I expect the same is true of perceptual hashes.