[Cryptography] improved identification of non-targets

[Henry Baker]

Additional IFF data points:

Drones sold in the U.S. have many restrictions on flying which are *enforced* by the done's GPS guidance computer.  (E.g., DJI incorporates a "No Fly Zone".)  Are we now going to install a similar system in airliners which prohibits entry into certain airspaces?

I believe that the U.S. NOTAM was published *prior* to the Ukranian airliner being shot down.  However, whether this NOTAM was minutes prior, or hours prior, I haven't been able to determine.

Flight KAL007 shot down by mistake by Soviets instead of a *nearby* U.S. spy plane.

Re Ukraine 752: do we know for certain that *no* U.S. spy planes/drones were in the vicinity?  I'm not yet willing to concede that the following did not happen: a U.S. spy plane/drone was sighted, but the Iranian antiaircraft missile locked onto the easier target -- a nearby Ukrainian airliner.

British ship HMS Sheffield, which may have been lost due to Exocet missiles manufactured by an *ally*, France.  IFF doesn't work if you think that the missile was fired by a friendly.  On the flip side, the Brits did shoot down one of their own helicopters in the Falklands war due to IFF problems.

The U.S. was fully prepared to shoot down airliners on 9/11/01, which is why all non-military air traffic ceased for a number of days.  Even today, do we know *for certain* that UA Flight 93" *wasn't* intentionally shot down by U.S. interceptors instead of the vastly more romantic/patriotic notion that the passengers were able to wrestle control from the hijackers?  (Unfortunately, the result was the same, except for the lack of blow-back from a possible shootdown.)