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Biometrics identification consists in finding one person out of a number of people based on the analysis of a physical characteristic, such as a fingerprint or an image of the iris. The characteristic is collected by a sensor, analysed, and compared by software to previously collected personal data.
Many physical traits can serve for biometric identification. In addition to the fingerprint or iris, there are recognition systems based on the hand, the ear, the face, the voice, the dynamic characteristics of a signature, or DNA. To identify a person, the system compares the characteristic detected by a sensor with those in its database. Some techniques are easier to fool than others. To obtain a high level of security, several systems of identification are sometimes combined, including traditional devices (such as passwords).