Visually send Morse Code from a keyboard LED (Num Lock, Caps Lock, or Scroll Lock.
I was inspired by a paper written by Mordechai Guri, Boris Zadov, Dima Bykhovsky, Yuval Elovici titled "CTRL-ALT-LED: Leaking Data from Air-Gapped Computers via Keyboard LEDs" https://arxiv.org/pdf/1907.05851.pdf
xdotool package
Debian/Ubuntu:
sudo apt install xdotool
Redhat/Centos:
sudo yum install xdotool
./kbdled "the quick brown fox jumps over the lazy dog"
Change the Morse Code speed by changing the TIME variable at the top of the script.
Change led to blink by changing the KEY variable at the top of the script.
I did find an issue on some keyboards brands where the Num Lock or Caps Lock LED won't blink until I first physically press the lock key to turn it on once. Then running kbdled works.