The single coolest thing in the paper (other than Shamir's name): "On many laptops (e.g., most Lenovo ThinkPad models), the chassis potential can be easily reached by a human hand, through metal connectors and conductive coating on metal surfaces. Thus, an attacker can measure the chassis potential by merely touching the laptop chassis with his hand. Surreptitiously, the attacker can simultaneously measure his own body potential relative to the room’s ground potential, e.g., by having a concealed differential probe touching both his body and some nearby conductive grounded surface in the room. Perhaps surprisingly, even this circuitous measurement offers sufficient signal-to-noise ratio for the key extraction attack."