NDLI: Comparative analysis of related notions of opacity in centralized and coordinated architectures

Content Provider	Springer Nature Link
Author	Wu, Yi Chin Lafortune, Stéphane
Copyright Year	2012
Abstract	Opacity is a confidentiality property that captures whether an intruder can infer a “secret” of a system based on its observation of the system behavior and its knowledge of the system’s structure. In this paper, we study four notions of opacity: language-based opacity, initial-state opacity, current-state opacity, and initial-and-final-state opacity. Initial-and-final-state opacity is a new opacity property introduced in this paper, motivated by secrecy considerations in anonymous network communications; the other three opacity properties have been studied in prior work. We investigate the relationships between these opacity properties. In this regard, a complete set of transformation algorithms among the four notions is provided. We also propose a new, more efficient test for initial-state opacity based on the use of reversed automata, and present a trellis-based test for the new property of initial-and-final state opacity. We then study the notions of initial-state opacity, current-state opacity, and initial-and-final-state opacity in the context of a new coordinated architecture where two intruders work as a team in order to infer the secret. In this architecture, the intruders have the capability of combining their respective state estimates at a coordinating node. In each case, a characterization of the corresponding notion of “joint opacity” and an algorithmic procedure for its verification are provided.
Starting Page	307
Ending Page	339
Page Count	33
File Format	PDF
ISSN	09246703
Journal	Discrete Event Dynamic Systems
Volume Number	23
Issue Number	3
e-ISSN	15737594
Language	English
Publisher	Springer US
Publisher Date	2012-09-06
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Language-based opacity Initial-state opacity Current-state opacity Initial-and-final-state opacity Coordinated architecture Systems Theory, Control Operations Research/Decision Theory Convex and Discrete Geometry Electrical Engineering Manufacturing, Machines, Tools
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering Modeling and Simulation

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