Yep, we generate card numbers for scratch cards for recharging, transfer numbers for guys like western union etc; lots of *true* randomness and a little math. We use entrphy to generate real randomness (computer randomness is never really random because computers can't "think" on their own) /dev/random, /dev/urandom, http://en.wikipedia.org/wiki/dev/random, http://en.wikipedia.org/wiki/Random_number_generator are good places to start Basically just come up with your own but start with a source that will give you real random numbers and y ou should be good to go. -----Original Message----- From: Peter Muchemi [mailto:pmuchemi@gmail.com] Sent: 12 July 2010 5:00 p To: Skunkworks forum Subject: [Skunkworks] scratch cards generating algorithm Hi, Any one with info on how scratch cards numbers are generated. Like for safcom? To prevent hacking, reverse engineering.