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Building Verifiable Trusted Path on Commodity x86 Computers

by: Zongwei Zhou, Virgil D. Gligor, James Newsome, Jonathan M. McCune
In Proceedings of the 2012 IEEE Symposium on Security and Privacy (2012), pp. 616-630, doi:10.1109/sp.2012.42  Key: citeulike:12172116

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Abstract

A trusted path is a protected channel that assures the secrecy and authenticity of data transfers between a user's input/output (I/O) device and a program trusted by that user. We argue that, despite its incontestable necessity, current commodity systems do not support trusted path with any significant assurance. This paper presents a hyper visor-based design that enables a trusted path to bypass an untrusted operating-system, applications, and I/O devices, with a minimal Trusted Computing Base (TCB). We also suggest concrete I/O architectural changes that will simplify future trusted-path system design. Our system enables users to verify the states and configurations of one or more trusted-paths using a simple, secret less, hand-held device. We implement a simple user-oriented trusted path as a case study.


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