An enclosure works in conjunction with a mobile device to capture biometric identifiers. The mobile device has a screen on a first side and a camera on a second side opposite the first side. The enclosure at least partially covers the mobile device on the first and second sides. The enclosure includes a fingerprint subsystem configured to capture fingerprints with sufficient resolution for biometric identification. The fingerprint subsystem is located on a portion of the enclosure covering the second side of the mobile device. The enclosure includes an iris imaging subsystem configured to capture iris images with sufficient resolution for biometric identification. The iris imaging subsystem includes an iris imaging aperture facing outward from the portion of the enclosure covering the second side of the mobile device. The enclosure includes an electronic data interface configured to communicatively couple the fingerprint and iris imaging subsystems to the mobile device.
