I need a function or procedure that will encrypt an alpha numeric string. Nothing complex, just a mapping (or something) that changes the string to something you couldn't make sense of and then back again. I am not fussed about security of access, just security of interpretation. Something like a mapping where A =Code1 and B=code2 C= code3.
I figure, someone would have done this before.
Code snippets or links are all I need.