The face recognition physical sensor is complemented to audit the cyber identification of the infrastructure operators to ensure the cyber identification used to access the restricted operations is complemented with the physical identification of the personnel assigned the respective security clearance role. The detector integrates a low-cost video stream capture system that is continuously processed by the deep-learning module equipped with the database of the critical infrastructure operators. The detector notifies the central command center with the identity of the personnel gaining access to the restricted regions of the infrastructure operations. The performance of the detector is dependent upon several environmental factors including the lighting and the availability of facial features. The two components of detector correspond to the detection and the recognition. The long-range detection capability of the physical sensor extending upto 20m and has been successfully validated against indoor and outdoor lighting conditions.