Casting hacking is a term related to someone who is able to access smart devices through unsecured networks. You can prevent this by utilizing secure passwords and wifi networks.
Also be aware that where that web page says to look for "Screencasting" in Settings, Samsung phones call this feature "Smart View" and you should look for that setting instead.
I think max headroom was the first signal intruder with live casting. If you have mirroring device and a weak network it can be interrupted by another users video. If you have a stream key and that is shared or found out by someone, then it will be vulnerable for one to intrude. What device are you referring to and always use Autoblocker feature that will help secure your casting if by phone. I'm assuming this by the way.
