Assuming I have a good sized key with a really, really good passphrase, how easy will it be to crack GnuPG encryption if the cracker has access to the Private Key? [Believe it or not, I have a port of GnuPG that runs as a command line app on a PocketPC. Right now I can't think of a convenient way to keep the Private key off the device, it can't use a USB keychain.]