Hi,

Been a while since I have been here. I will rather jump to the point then chit chatting.

I need to create a self validating number. Does anyone here has an experience to create an algorithm to achieve such things? What sort of base data is required? e.g. Seed value which is used to generate a number or something like that.

Basicall I need to create a barcode number for users so they can scan the barcode rather than entring the username everytime (basically for auditing and tracing of files purposes).

So what I would like to do is create a unique barcode for each user that can be printed but upon scan the an application on the PDA Scanner should be able to varify that the number indeed is the correct one before sending it to the server for the database verification. This is much like Credit Card or Social Security Number or ABN/ACN/TFN (for those who live in Australia).

Does this all make any sense? Please let me know if anymore information is required.

Cheers