A method of operating an access control system (100, 600, 700, 900, 1200, 1300, 1700, 1800, 1900), the method comprising: - recording fingerprint data corresponding to one or more fingers of a particular authorized person; - recording a sequence of finger positions for the particular authorized person; - providing drive signals to a fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902) and a plurality of drive signal injection points (114, 614) at least partially surrounding the fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902) with each drive signal injection point (114, 614) corresponding to an angular position about the fingerprint sensor (102, 602, 702, 902, 1202, 1302, 1702, 1802, 1902), each drive signal injection point (114, 614) is provided with a unique drive signal (126, 626, 726) and the drive signal (126, 626, 726) corresponding to each drive signal injection point (114, 614) is distinguishable from the drive signal (126, 626, 726) corresponding to each other drive signal injection point (114, 614); - receiving a series of fingerprint signals (152, 652, 752, 952) from the fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902), wherein each fingerprint signal (152, 652, 752, 952) corresponds to at least one drive signal (126, 626, 726) coupled to the fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902) by a finger when the fingerprint signal (152, 652, 752, 952) is received; - determining a sequence of angular positions corresponding to sequential fingerprint signals (152, 652, 752, 952) in the series, wherein the angular position of a fingerprint signal (152, 652, 752, 952) is determined by determining the at least one drive signal (126, 626, 726) to which that fingerprint signal (152, 652, 752, 952) corresponds; - determining if each of the fingerprint signals (152, 652, 752, 952) corresponds to the recorded fingerprint data; - determining if the sequence of angular positions corresponds to the recorded sequence of finger positions; and - if the fingerprint signals (152, 652, 752, 952) correspond to the recorded fingerprint data and the sequence of angular positions corresponds to the recorded sequence of fingerprint positions, then providing an authorization signal. - recording fingerprint data corresponding to one or more fingers of a particular authorized person; - recording a sequence of finger positions for the particular authorized person; - providing drive signals to a fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902) and a plurality of drive signal injection points (114, 614) at least partially surrounding the fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902) with each drive signal injection point (114, 614) corresponding to an angular position about the fingerprint sensor (102, 602, 702, 902, 1202, 1302, 1702, 1802, 1902), each drive signal injection point (114, 614) is provided with a unique drive signal (126, 626, 726) and the drive signal (126, 626, 726) corresponding to each drive signal injection point (114, 614) is distinguishable from the drive signal (126, 626, 726) corresponding to each other drive signal injection point (114, 614); - receiving a series of fingerprint signals (152, 652, 752, 952) from the fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902), wherein each fingerprint signal (152, 652, 752, 952) corresponds to at least one drive signal (126, 626, 726) coupled to the fingerprint sensor (102, 602, 702, 902, 1202, 1602, 1702, 1802, 1902) by a finger when the fingerprint signal (152, 652, 752, 952) is received; - determining a sequence of angular positions corresponding to sequential fingerprint signals (152, 652, 752, 952) in the series, wherein the angular position of a fingerprint signal (152, 652, 752, 952) is determined by determining the at least one drive signal (126, 626, 726) to which that fingerprint signal (152, 652, 752, 952) corresponds; - determining if each of the fingerprint signals (152, 652, 752, 952) corresponds to the recorded fingerprint data; - determining if the sequence of angular positions corresponds to the recorded sequence of finger positions; and - if the fingerprint signals (152, 652, 752, 952) correspond to the recorded fingerprint data and the sequence of angular positions corresponds to the recorded sequence of fingerprint positions, then providing an authorization signal.