Biometrics' new identity--measuring more physical and biological traits: Research into the characteristics that are unique to an individual is addressing the need to correctly identify people in a variety of medical, social and security contexts.

Abstract

There is no need to remember complex combinations of random numbers and characters. From now on, you are the password: your fingerprint, face, iris, gait or odour—any of your potentially unique attributes—can theoretically be used to identify you. This is the idea behind biometrics, which was once confined to the realm of spy movies and high‐security facilities, but is now increasingly common in everyday security checks at borders, for secure payments and logging in to mobile devices. Beyond security, though, biometrics technology is also driving and enabling other applications that include forensic science, data sharing over networks and reducing identification errors in hospitals. > Biometrics is essentially ready for mass application, as the success of the Indian Aadhaar programme demonstrates. While fingerprints and retina patterns are the most well‐known biometric identifiers, they are not the only characteristics that can be used for biometric identification. Physical traits such as the shape of the face, hand or ear, the vasculature in the finger or DNA—so‐called hard biometrics—as well as behavioural characteristics such as gait, signature, voice and typing patterns can all be used to identify individuals (Fig 1). Another large and rapidly expanding category—which includes characteristics such as skin or eye colour, height, weight and tattoos—is known as “soft biometrics” and provides less distinctive, less categorical information, but has the advantage that such traits can be measured from a distance without cooperation from the subject. Even body odour is being actively explored as a practicable biometric identifier (http://www.sciencedaily.com/releases/2014/02/140204073823.htm). Figure 1. Examples of biometric traits. (A) Fingerprints, palm prints, hand vasculature, hand shape and signature. (B) Face, DNA, sclera (on the eyeball), ear shape and typing patterns (keystroke dynamics). (C) Teeth (forensic odontology), gait, voice or speech, iris and retina. Some of these traits—fingerprints, palm prints, face, voice, teeth, ear shape and DNA—are also used in forensics. Reproduced with permission …