> Is there a distance that could be calculated between 2 hashes and tell if they are similar ? Yes, maybe: https://en.wikipedia.org/wiki/Locality-preserving_h

> Is there a distance that could be calculated between 2 hashes and tell if they are similar ? Yes, maybe: https://en.wikipedia.org/wiki/Locality-preserving_hashing https://en.wikipedia.org/wiki/Locality-preserving_hashing > So are your old passwords stored in plain text somewhere so they can compare? You betcha!