Faces are highly deformable objects which may easily change their appearance over time. Not all faces areas are subject to the same variability. The SIFT approach in the context of face authentication. Several pattern recognition and classification techniques have been applied to the biometrics domain. Among them, an interesting technique is the Scale Invariant Feature Transform (SIFT), originally devised for object recognition. The SIFT is used for extracting local features. The recognition proceeds by matching individual features to a database of features from known objects.