Transforming Opacity Verification to Nonblocking Verification in Modular Systems
Journal article, 2019

We consider the verification of current-state and K-step opacity for systems modeled as interacting nondeterministic finite-state automata. We describe a new methodology for compositional opacity verification that employs abstraction, in the form of a notion called opaque observation equivalence, and that leverages existing compositional nonblocking verification algorithms. The compositional approach is based on a transformation of the system, where the transformed system is nonblocking if and only if the original one is current-state opaque. Furthermore, we prove that K-step opacity can also be inferred if the transformed system is nonblocking. We provide experimental results where current-state opacity is verified efficiently for a large scaled-up system.

nonblocking verification



finite-state automata

modular systems


Sahar Mohajerani

University of Michigan

Stéphane Lafortune

University of Michigan

IEEE Transactions on Automatic Control

0018-9286 (ISSN)

Vol. 65 4 1739-1746 19488068

Subject Categories

Communication Systems


Control Engineering



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