A method for authenticating a face presented to a device comprising an imager, a screen and a processing unit, comprising the steps in which: - the imager acquires at least one initial image of a face presented in the acquisition field of the imager, - the processing unit determines a pose of the face from the initial image, and from this face pose, determines a reference pose, a face pose being defined by at least two pose angles representative of an orientation of the face appearing in an image, and the processing unit determines a target position placed randomly or pseudo-randomly in a target space at a distance from a reference position corresponding to the reference pose, said target position corresponding to a target pose, - the screen displays a displayed image comprising at least one visual orientation mark initially at the reference position determined from the pose of the face in the initial image, and a visual target at the target position, - the imager acquires a stream of images of the face presented in the acquisition field, and for a plurality of successive images of said image stream: - the processing unit determines a pose of the face in each image of the plurality of successive images, - the processing unit determines successive positions of the visual orientation mark according to the successive poses of the face with respect to the reference pose in the plurality of successive images, - the image displayed by the screen is updated by moving the visual orientation mark according to the successive positions of the visual orientation mark determined according to the successive poses of the face with respect to the reference pose in the plurality of successive images, - the processing unit authenticates the presented face when, following the displacement of the visual orientation mark, there is a match between the position of the visual orientation mark and the target position where the visual target is located, corresponding to a match between the face pose and the target pose, otherwise the face presented in the acquisition field is considered as fraud. - the imager acquires at least one initial image of a face presented in the acquisition field of the imager, - the processing unit determines a pose of the face from the initial image, and from this face pose, determines a reference pose, a face pose being defined by at least two pose angles representative of an orientation of the face appearing in an image, and the processing unit determines a target position placed randomly or pseudo-randomly in a target space at a distance from a reference position corresponding to the reference pose, said target position corresponding to a target pose, - the screen displays a displayed image comprising at least one visual orientation mark initially at the reference position determined from the pose of the face in the initial image, and a visual target at the target position, - the imager acquires a stream of images of the face presented in the acquisition field, and for a plurality of successive images of said image stream: - the processing unit determines a pose of the face in each image of the plurality of successive images, - the processing unit determines successive positions of the visual orientation mark according to the successive poses of the face with respect to the reference pose in the plurality of successive images, - the image displayed by the screen is updated by moving the visual orientation mark according to the successive positions of the visual orientation mark determined according to the successive poses of the face with respect to the reference pose in the plurality of successive images, - the processing unit authenticates the presented face when, following the displacement of the visual orientation mark, there is a match between the position of the visual orientation mark and the target position where the visual target is located, corresponding to a match between the face pose and the target pose, otherwise the face presented in the acquisition field is considered as fraud.