Malware such as Trojan Horses and spyware remain to be persistent security threats that exploit the overly complex graphical user interfaces of today's commodity operating systems. This paper presents the design and implementation of Nitpicker - an extremely minimized secure graphical user interface that addresses these problems while retaining compatibility to legacy operating systems. It describes the approach of kernelizing the window server and presents the deployed security mechanisms and protocols. The paper discusses key techniques such as client-side window handling, a new floating-labels mechanism, drag-and-drop, and denial-of-service-preventing resource management.
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