I'm looking for a way to encrypt a file on my desktop computer move it to my pocket pc where it will be decrypted when I access it than encrypted again when I close out my program that opened it on my pocket pc. The file will be copied to my sd card and accessed from their that is why i want it encrypted when i move it and only decrypted when my program opens it that encrypted again when I close my program Does anyone know of a way to do this? I have a way in my mind, but I just keep getting a block when I go to code it. If anyone has some code that will help that would be great. The simpler the better. Does this make sense?