I've written my own too!!!
Let's face it, one doesn't have to be too paranoid to wonder what some developers
do/want behind the scenes, no matter what 'Algorithms' they 'purport' to use!!!
I have LOTS of logons/logins for all manner of sites/services, including eBay, PayPal,
various Banks, Forums etc etc etc. Of course, I don't use something Stupid like peoples
birthdays etc, but is a special system that no-one would ever understand!!
Still, I have my own personal software for storage/infusion, I laugh to myself, because
I know my coding is SO different from what exists, that is absolutely untraceable!