3 ms·

I agree that it's practically not a concern, but the local part of an email address[0] is up to 64 characters in an alphabet of size 72, and the domain part is

• fleitz 15y ago
  If the set of data did contain 3e519 entries then yes it certainly would generate collisions, however it you look at a more restrictive set of data, lets say 5 emails per person alive then you're looking at about 2^35 email addresses which could easily be hashed by MD5 with out a significant chance of collision. Instead of an MD5 they could just as easily upload a bloomfilter which would expose even less data and would compress it significantly, however it would be more computationally expensive to generate matches that way vs. hashing.
• foobarbazetc 15y ago
  That's irrelevant, since this isn't crypto. This is matching user email addresses so they can spam you and your friends and grow their company on the back of dodgy practices.