The next form of biometric identification may be a heart scan.A group of computer scientists have proposed a system called Cardiac Scan, which uses a cheap and cheerful Doppler radar to wirelessly map out the dimensions of your beating heart. They say your old ticker’s shape and pulsations are unique, and therefore useful for identifying you, authenticating access, unlocking devices, and so on.Wenyao Xu, the lead author of a paper on the technique, said on Monday: “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.”To test their radar design, the team conducted a study of 78 people. Their technology scored a 98.61 per cent balanced accuracy with an equal error rate of 4.42 per cent. Test subjects had to sit completely still in a chair in front of the sensor hardware a metre away during the trials. Random body movements and noise can affect the accuracy of the system. It can fail to work when the signals from “large body movements” cause circuit saturation.
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