A biometric device that may include a sensor that reacts to a chemical element associated with a sweat gland; wherein when the sensor is contacted by an area of a skin of a person, an image that comprises information about locations of sweat glands within the area of the skin of the person is generated by the sensor; an image processor that is configured to generate an authentication result by comparing between (a) the information of the image generated by the sensor and (b) reference information of locations of sweat glands of a given person; wherein the authentication result indicates whether the person is the given person; and a communication module for communicating an authentication result indication.
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