This document is an introduction to the Citadel architecture. It addresses the means by which systems can be protected from compromise due to physical attacks.
This work is part of a project in the Distributed Security Systems group in the Research Division. It draws upon architectural ideas from the IBM Transaction Security System [IBM91], the IBM Integrated Cryptographic Feature [lBM90b], and from previous work on secure processors in the Research Division.
This architecture is intended to be independent of the particular computing system, and computing environment, in which it is used. We will, however, use it as a basis for developing a prototype secure processor for an IBM PS/2 running under the OS/2 operating system.
Substantial changes from the previous version of the document are marked by bars to the left of the text, as on this paragraph. Minor typographical and punctuation corrections are not marked.
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Published in: RC16672 in 1991
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