Researchers at the University of Buffalo have unlocked a new, non-contact, remote biometric tool that measures the size of the human (user’s) heart to detect their presence and unlock the computer. Researchers claim that the system, that uses low-level Doppler radar, is a safer and potentially more effective alternative to passwords and other biometric identifiers, and may eventually be used for smartphones and at airport screening barricades. The signal strength of the system’s radar is much less than Wi-Fi, the radiation is about 5 milliwatts and it needs about 8 seconds to scan a heart for the first time. Therefore, it doesn’t pose any health threat. Since no two people with identical hearts have ever been found, and people’s hearts do not change shape, unless they suffer from serious heart disease, the system is quite reliable. The technology is described in a paper that the inventors will be presenting at next month’s 23rd Annual International Conference on Mobile Computing and Communication (MobiCom) in Utah.