Do the authorities know?
I can assure you the authorities have taken notice of network security on transport category airplanes and that the issue has been addressed during aircraft certification. Keeping up technologically is a challenge, though, no doubt, and can make no claims that a "water-proof" solution has been established.
I am equally concerned that the horse is, or soon will be, out the barn, but not that the issue is getting no attention. My personal belief is that Wifi, internet and bluetooth connectivity has NO place on the flight deck with aircraft systems associated with operating the airplane. Mere "separation", encryption and password security is inadequate. The potential for disastrous interference, whether intentional or not, is too dire. Desktop cyber security is not sufficient for aviation application - and as the current news will tell you, just about anything related to data and communications, whether corporate or government is subject to malicious action.