Researchers from the University of California published a paper describing their study on how the thermal residues collected from users who entered both weak and strong passwords can be recovered as late as 1 minute after entry. Researchers say Hunt-and-Peck Typists are highly vulnerable, they result in greater heat transfer, due to longer contact duration with a larger contact area. For Touch typists, two factors confuse their thermal residues and make passwords harder to harvest. Researchers concluded that Work sheds some light on understanding the thermodynamic relationship between human fingers and external computer keyboards”]
Source: https://gbhackers.com/thermanator-attack-password-keyboards/