A True Random Number Generator seems to be a mathematical myth. However, we can still get pretty good random number generators. This AVR uses noise sampled from a transistor in the breakdown region which should be seemingly random. The schematic layout & source code is available in the project write-up!
PyroFactor: 
October 6th, 2009 at 5:15 pm
Wow thanks for the information but tell me it really help in to break the codes
November 22nd, 2009 at 7:52 pm
I need a portable generator that I can set the series of numbers.(1-25, 1-30,
etc.). Also, once the number is selected, it will be eliminated from the series.
The selected number could be eliminated manualy by a designated toggle
switch.
Any ideas you might have will be greatly appreciated.