The IR ring: authenticating users' touches on a multi-touch display
UIST '10 Proceedings of the 23nd annual ACM symposium on User interface software and technology
IdWristbands: IR-based user identification on multi-touch surfaces
ACM International Conference on Interactive Tabletops and Surfaces
Quire: lightweight provenance for smart phone operating systems
SEC'11 Proceedings of the 20th USENIX conference on Security
User-Driven Access Control: Rethinking Permission Granting in Modern Operating Systems
SP '12 Proceedings of the 2012 IEEE Symposium on Security and Privacy
Fiberio: a touchscreen that senses fingerprints
Proceedings of the 26th annual ACM symposium on User interface software and technology
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The design of modern desktop operating systems is based on the assumption that a single user controls input and output devices at a time. This is also the case for access control, where applications inherit the privileges from the user that started them. This is not sufficient for multi-user collaboration on Single Display Groupware (SDG) or tabletop systems. For these we suggest a more fine-grained access control method based on the user that is interacting with an application. In our ongoing work of building a multi-user multitouch system we developed a technique we call event backtracking that exploits the asynchronous behavior of modern desktop applications on the Mac OS X platform. Event backtracking follows the execution of a program and tags threads with user IDs taken from the input events of users. This information is subsequently used to dynamically restrict applications' access rights. Our implementation works within applications as well as across application borders, transparent to the applications themselves.