How to store data and program permanently in an FPGA?

From what I surfed, once the power goes off in an FPGA you've to program it again. But I'm trying to implement an FPGA based security system using verilog. In that, I want the password of the system to be permanently stored i.e. even when the power goes off the password shouldn't be erased. It'll also be good if the program can be stored too. I'm a beiginner in FPGA. So please tell me how to do this. The device is XC3S400 Spartan 3 Family.