Fingerprint authentication is a convenient technique for authentication on consumer devices such as smartphones, tablets, laptop computers, etc. However, some users have concerns regarding privacy of their fingerprint data. This disclosure addresses such privacy concerns while retaining the ability for users to utilize fingerprint authentication. Per this disclosure, an obfuscating capacitive layer along with a capacitive sensor is placed on a fingerprint sensor, or is integrated in a fingerprint sensor. The layer generates a random pattern at the time of creation of the layer. This pattern along with the user’s fingerprint is recognized and used to authenticate a user. In this manner, a user’s fingerprints are not used directly, which enhances user privacy. Since the layer does not change over time, the sensor generates deterministic patterns in response to the user’s fingerprints and makes authentication possible.
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Ogutu, David, "Obfuscator Overlay for Fingerprint Sensor", Technical Disclosure Commons, (July 12, 2017)