Biometric Tech Uses Sound To Distinguish Ear Cavity Shape
Orome1 writes: NEC is developing a new biometric personal identification technology that uses the resonation of sound determined by the shape of human ear cavities to distinguish individuals. The new technology instantaneously measures (within approximately one second) acoustic characteristics determined by the shape of the ear, which is unique for each person, using an earphone with a built-in microphone to collect earphone-generated sounds as they resonate within ear cavities.
The problem with ear cavities is that there are two of them, so you've got to get the correct one. A better candidate would be one of the singular body cavities. Just as long as 'everybody has one".