I am not American, so I don't know the rules of ssn. However, can someone calculate what are the chances I guess a valid ssn, if I know all the ssn rules?
Very good. I don't know all the details but part of the SSN is the hospital ID where you were born, and part of it is time-based. It's just enough that someone trying to drink coffee while perusing the rules won't instantly know everyone's SSN, but a sophisticated actor could probably get someone's SSN down to 100ish guesses.
