>I'm trying to implement a strategy by which a VFP application can send encrypted data to a .NET 3.5 Web Service. I've managed to get unencrypted data sent from the app to the Web Service with a minimum of problems, so the only thing left to implement is encryption. I know of at least two ways that VFP can encrypt data, the FFC Crypto class and the vfpencryption71 FLL. What I need to know is how to set up one of these such that the Web Service can understand what is being sent, as well as what strategy should be used by the Web Service to decrypt the data. Any assistance in this would be appreciated.

If you really need to encrypt, then it is a question of knowing if you control both ends. If yes, then you need to decide on which encryption mechanism to use. As you need to support two development environments, you would have to expose a DLL which both environments can access to encrypt and decrypt. So, basically, you would end up building a separate project, probably in .NET, to encrypt and decrypt. Then, from VFP, you can load it and call its encryption method. From .NET, you just need to add a reference to it in your project and decrypt.