Anti-Spoofing Protection for Fingerprint Controllers

A fingerprint sensing circuit, comprising:

• a hardware scan engine coupled with a set of electrodes of a fingerprint sensor, wherein the hardware scan engine is configured to sense a surface pattern of an object at the fingerprint sensor;
• and
• a spoof detection logic module coupled with the hardware scan engine and configured to:
• in response to detecting the presence of the object at the fingerprint sensor, measure a set of physical properties of the object based on one or more signals from the set of electrodes, wherein the set of physical properties includes at least one of a subdermal compliance of the object and a surface adhesiveness of the object, and
• distinguish the object as an actual finger or a spoof based on the one or more physical properties.

A fingerprint sensing system, comprising:

• a fingerprint sensor;
• a fingerprint sensor controller coupled with the fingerprint sensor and configured to:
• sense a surface pattern of an object at the fingerprint sensor;
• detect a presence of the object at the fingerprint sensor,
• in response to detecting the presence of the object, measure a set of physical properties of the object based on one or more signals from a set of electrodes of the fingerprint sensor, wherein the set of physical properties includes at least one of a subdermal compliance of the object and a surface adhesiveness of the object, and
• generate a spoof detection result by distinguishing the object as an actual finger or a spoof based on the one or more physical properties;
• and
• a host device coupled with the fingerprint sensor and configured to grant access to a resource based on the spoof detection result.