Change permissions on /dev/input on tty change?

[totony]

Hi, how can I prevent normal users in the "input" group to hook the nodes in /dev/input, thus allowing them to see whatever I type when in another tty?

Or is there any way to run a script when a terminal change occurs?

i.e. I don't want a user to be able to read the /dev/input nodes whenever/however he wants.