An apparatus, comprising: an electronic device including a processor, a memory, and a camera, wherein the device is to: prompt a person to perform a first physical body behavior comprising a first facial expression; obtain a first picture of the first physical body behavior with the camera; analyze the first picture to verify that the first picture shows the first physical body behavior; and characterized in that the device is further to: prompt the person to perform a second physical body behavior different than the first physical body behavior, the second physical body behavior comprising an expected physical change in at least a part of a face of the person and comprising a second facial expression; obtain a second picture of the second physical body behavior; and characterized by the device further to: compare the second picture with the first picture to detect the expected physical change; and verify, before granting the person access to at least one predetermined feature of the electronic device, that the person is a living person and the physical body behavior shown in the second picture is the second physical body behaviour in response to detecting the expected physical change. prompt a person to perform a first physical body behavior comprising a first facial expression; obtain a first picture of the first physical body behavior with the camera; analyze the first picture to verify that the first picture shows the first physical body behavior; and characterized in that the device is further to: prompt the person to perform a second physical body behavior different than the first physical body behavior, the second physical body behavior comprising an expected physical change in at least a part of a face of the person and comprising a second facial expression; obtain a second picture of the second physical body behavior; and characterized by the device further to: compare the second picture with the first picture to detect the expected physical change; and verify, before granting the person access to at least one predetermined feature of the electronic device, that the person is a living person and the physical body behavior shown in the second picture is the second physical body behaviour in response to detecting the expected physical change. prompt the person to perform a second physical body behavior different than the first physical body behavior, the second physical body behavior comprising an expected physical change in at least a part of a face of the person and comprising a second facial expression; obtain a second picture of the second physical body behavior; and characterized by the device further to: compare the second picture with the first picture to detect the expected physical change; and verify, before granting the person access to at least one predetermined feature of the electronic device, that the person is a living person and the physical body behavior shown in the second picture is the second physical body behaviour in response to detecting the expected physical change. compare the second picture with the first picture to detect the expected physical change; and verify, before granting the person access to at least one predetermined feature of the electronic device, that the person is a living person and the physical body behavior shown in the second picture is the second physical body behaviour in response to detecting the expected physical change. <EOS>