we also do data masking with below steps,
1) updating credit card information (randomly generated alpha-numeric words)
2) emails : adding some irrelevant prefix to profiler name plus changing the domains.
3) upodating other payment related columnns ( full fledge columns updates)4) chagin the contact details too like mobile nos.
i must say all the above steps are time- consuming (week - long - running jobs at)
-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)