3 ms·

Off the top of my head, two letters followed by two numbers seems relatively safe.

• coredog64 4y ago
  At a previous employer, we used to randomize people’s network logon ID. I don’t recall all the rules, but the big one was removing all the vowels from the set of possible characters. It was robust enough that it worked internationally: US, Malaysia, France, and Czech Republic.
  • vore 4y ago
    Removing all the vowels isn't enough, you can still name someone "FVCK" or "CVNT".
    • Mordisquitos 4y ago
      You just have to treat 'V', 'Y' and 'W' as honorary vowels and remove them as well.
      • tsukikage 4y ago
        ...just skip to the inevitable end of this process and have everyone use the logon ID "BBBB"