LCD pwn System: How to modulate screen brightness to covertly transmit data from an air-gapped computer... slowly

To be honest, it was the impracticality and inefficiency that first attracted us to this otherwise cunning exfiltration

Boffins from Ben-Gurion University of the Negev and Shamoon College of Engineering in Israel have come up with yet another TEMPEST-style attack to exfiltrate data from an air-gapped computer: leaking binary signals invisibly by slightly modulating the light coming off its monitor."