Take a look at Cipher for VFP5 File #9222.

>Need to encrypt hourly rates stored in a rates table and decrypt them at report run time. The encryption routine needs to use a seed or key value that is known to just the folks in personnel. At report runtime, they would be asked to specify the seed or key value, which would be used to decrypt the rate values. this way, the developers cant decrypt the rates themselves. So something like the Maxframe X3ED program
>

>?X3ED("E",cTextToEncrypt)
>?X3ED("D",cTextToDecrypt)
>

>wont work cuz the developers have access to this X3ED code (or any code that doesnt use a seed/key value).
>
>Any suggestions?