https://www.techradar.com/news/creative-keyboard-attack-allows-passwords-to-be-stolen-using-the-heat-from-your-fingers

Security researchers are arguing that passwords represent an increasingly wobbly method of verification, following the discovery of an exploit that can potentially discern a password using the thermal energy residue left on recently pressed keys.

As spotted by Bleeping Computer, computer scientists from the University of California, Irvine (UCI), have named the attack Thermanator, and it involves the usage of a ‘mid-range thermal camera’ to scan the keys and detect the heat residue left on them.