My post to you somehow disappeared; pardon me if this is a repost.
802.1X/RADIUS is a IETF network standard, it is not originated from Microsoft, but XP implements it. So do some network switches (Cisco).
Routing control packets to the right tower along the flight path is, of course, no problem.
From CBS in NYC.
Much of the emphasis in aircraft design is in avoiding single point failure modes (no one thing, if it breaks, can jeopardize the integrity of the aircraft). Having a system that allows someone to take control from the ground (no matter how "secure") violates this time-tested design philosophy in a massive way.
Interesting thing about this approach is not only is it a single point of failure for any one aircraft but it may very well be a single point of failure for virtually every aircraft flying at any one time. Instead of 1-4 aircraft crashing, you can imagine *all* of them crashing at the same time if the remote control system is compromised.
Hypothetical question: Has an unbreakable encryption system ever been developed? The marketers might say "yes" but the cryptologists will always qualify their assertions with "not yet" or "it would be impossible with today's technology" or some such.
RE:
My post to you somehow disappeared; pardon me if this is a repost. 802.1X/RADIUS is a IETF network standard, it is not originated from Microsoft, but XP implements it. So do some network switches (Cisco). Routing control packets to the right tower along the flight path is, of course, no problem.