Encrypting credit card data

[George Simon]

Does anyone know of a recognized encrypting program that can run from within
a filePro application?
Basically, I need to encrypt the credit card number, store it in a filePro
database, along with the customer's account number (not encrypted) and then
be able to decrypt it once it is needed again.
I've been doing my own "encryption" by basically re-arranging the middle
numbers of the credit card.  However, that is not good enough for
Visa/Mastercard.
Thanks 

George Simon