Authentication Device

FIG. 1 is a reduced-scale front, right side, top perspective view of an authentication device showing our new design; FIG. 2 is a front elevational view thereof: FIG. 3 is a rear elevational view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; and, FIG. 8 is a reduced-scale rear, left side, top perspective view thereof. The broken lines shown in the drawings depict portions of the authentication device that form no part of the claimed design.