If you're using your 770 as a remote X display the network traffic only contains information to your 770 about how to render your display and how you are reacting to the display. If you touch the numbers 3,7,4,9, for instance, that information is NOT being sent across the network. Only the remote X app knows that you've selected 3,7,4,9. Even this is done over the VPN that is secure shell. The data all sits remote to you, as does the app. If it doesn't sit remote to you then you're not using a remote display protocol and, yes, your island is communicating with another island, and everything you pass back and forth is vulnerable, just like in the PC network days. I suggest banking with a bank that has settled on Linux, even if that bank is 3,000 miles away from you. Then you can bank securely, if that bank also has enough sense to let you log in as a remote X user. You will be using their computer(s) not your own, and no data will ever be sent to you over the network except the data that your screen needs to render. Even numbers can be sent out to your display in a format that is rendered graphically, so it makes no sense at all to anyone except you. You've already seen this technique; it's how passwords are hidden from bots.