User authentication for a user device can leverage one or more fingerprint sensor regions capable of detecting and/or recognizing a user's fingerprints. The user can define a fingerprint gesture or sequence of fingerprint gestures as a passcode, with access to a protected function being conditional on the user performing the defined fingerprint gesture or sequence of fingerprint gestures. Different fingerprint gestures or fingerprint gesture sequences can invoke or authorize different functions of the device. Fingerprint gestures from two or more users in the same location or in different locations can be used to unlock a protected function of a device.