Abstract: An access control system is provided to prevent the surreptitious granting of access to privacy related functionality on an electronic device. Software-based events to grant access to device functionality can be validated by confirming that the software event corresponds with a hardware input event. This validation prevents the spoofing of a user interface input that may be used to fraudulently grant access to specific functionality.

Abstract: The subject disclosure provides systems and methods for providing privacy-preserving social attribution for electronic devices. For example, when information is received from a contact of a user at the user's electronic device, various applications at the electronic device may later display the received information. It can be desirable to attribute the displayed information received from the contact to that contact, without exposing identifying information of the contact to the displaying application. Aspects of the subject technology include a system process that generates an image including contact information, that can be rendered in a user interface of an application, without providing the image or the contact information to the application.

Abstract: An access control system is provided to prevent the surreptitious granting of access to privacy related functionality on an electronic device. Software-based events to grant access to device functionality can be validated by confirming that the software event corresponds with a hardware input event. This validation prevents the spoofing of a user interface input that may be used to fraudulently grant access to specific functionality.