Hi guys,
I have a string of fixed length that is made up of digits only (ascii 0x30 to 0x39) and has to be encrypted / scrambled (no fancy stuff required just some mangling would be enough but the fancy stuff are welcome as well) and the output should also be digits only and the length should be preserved (here's the catch).
Do you have any suggestions on well tested solutions for this situation? Custom solutions are not an option, it must be something well defined.
Thanks for your time...