Dr. Gregg Wildes Profile

Dr. Gregg Wildes

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Proceedings Article | 30 May 2022 Paper

High assurance state machine microprocessor concept: Aberdeen Architecture

Patrick Jungwirth, Gregg Wildes, James Brown, Michael Crowe

Proceedings Volume 12119, 1211909 (2022) https://doi.org/10.1117/12.2621053

KEYWORDS: Computer security, Information security, Computer architecture, Operating systems, Lithium, Computing systems, Microelectromechanical systems, Modulation, Resolution enhancement technologies, Planets

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The Aberdeen Architecture is a high assurance microprocessor architecture concept which implements Saltzer and Schroeder’s 1975 security principles in hardware. Current microprocessors execute instructions without any verification or authentication. Saltzer and Schroeder defined fundamental security principles: complete mediation, and open design. Complete mediation means to verify access rights and authority for every operation. Protection mechanisms should be based on open design principles: protecting keys, not design secrecy. In 2002, Mann describes how secrecy makes systems brittle and subject to catastrophic failure. The Aberdeen Architecture is high assurance computer architecture based on ‘open design’ principles, complete mediation, and RISC-V instruction set architecture. Aberdeen Architecture uses several hardware state machine monitors to enforce hardware security policies for the execution pipeline. The state machines’ security policies cover instruction execution, control flow integrity, data flow integrity, and memory access integrity. The individual security policies provide overlapping coverage. The security of the whole architecture is greater than the sum of the individual parts. The Aberdeen Architecture provides near complete mediation for instruction execution. This paper presents an introduction to the Aberdeen Architecture

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