Security by obscurity is not security, and usually a bad plan. Usually its the bad guys who find out first.
"Bad guys" come in many different types , ranging from the well prepared to the nutter that acts on the spirit of the moment. History shows that a very large proportion of bad guys, in an aviation context, are very high on political or religious ideas and pretty low on technical knowhow. Unlike software hackers the vast majority are not conversant with the finer workings of large commercial airliners why spoon feed that info in the tv just to spice up a bit of "news"?