Pin Generation

Question

I am looking to develop a system in which i need to assign every user a unique pin code for security. The user will only enter this pin code as a means of identifying himself. T

Answer 1

If you use random number generator algorithms, so you never have PIN like "00038384882" , starts with 0 (zeros), because integer numbers never begins with "0". your PIN must be started with 1-9 numbers except 0.

I have seen many PIN numbers include and begins many zeros, so you eliminate first million of numbers. Permutation need for calculations for how many numbers eliminated.

I think you need put 0-9 numbers in a hash, and get by randomly from hash, and make your string PIN number.