>>If all this function does is encrypt a password there are lots of examples written in c# out there ( Google is your friend )
>
>I did but so for I could not find a simple enough c# encrypt function that can be "duplicated" in VFP. You see I need a function that would do the same from VFP and c# end.
>Thank you.

Presumably you mean that the C# version should be usable with strings already encoded using the VFP cipher library that you mentioned?

Al's pointer to Rick's paper is still valid - you could create a small VFP com interop which could be accessed from .net.

But which functions of that library do you actually use ? - the core encryption is fairly straightforward.
I took a look at the original C code and it would seem that a C# version should be simple enough to implement......