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arXiv 1902.09411eess.SYcs.SY
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关于网络物理系统近似不透明性的研究

On Approximate Opacity of Cyber-Physical Systems

Shanghai Jiao Tong University(上海交通大学);University of Colorado Boulder(科罗拉多大学博尔德分校)

Xiang Yin, Majid Zamani

AI总结:

本文研究了网络物理系统中近似不透明性的概念,提出了一种新的方法来评估系统在入侵者测量精度下的安全保证水平,并讨论了如何构建近似不透明性保持的符号模型。

摘要:

不透明性是网络物理系统分析中的重要信息流安全属性,它捕捉了在存在可能访问信息流的入侵者时,系统秘密行为的合理否认。现有工作中仅考虑非度量系统,假设入侵者总能精确区分不同输出。本文将不透明性概念扩展到输出集配备度量的系统。此类系统广泛用于许多现实世界的建模,其测量是物理信号。为此提出了一个新的概念,称为近似不透明性,以定量评估相对于入侵者测量精度的安全保证水平。然后提出了一种新的模拟类型关系,称为近似不透明性保持模拟关系,该关系描述了两个系统在满足近似不透明性方面的接近程度。这使我们能够使用其抽象来验证大规模甚至无限系统的近似不透明性。我们还讨论了如何为一类离散时间控制系统构建近似不透明性保持的符号模型。我们的结果将不透明性的定义和分析技术从非度量系统扩展到了度量系统。

英文摘要:

Opacity is an important information-flow security property in the analysis of cyber-physical systems. It captures the plausible deniability of the system's secret behavior in the presence of an intruder that may access the information flow. Existing works on opacity only consider non-metric systems by assuming that the intruder can always distinguish two different outputs precisely. In this paper, we extend the concept of opacity to systems whose output sets are equipped with metrics. Such systems are widely used in the modeling of many real-world systems whose measurements are physical signals. A new concept called approximate opacity is proposed in order to quantitatively evaluate the security guarantee level with respect to the measurement precision of the intruder. Then we propose a new simulation-type relation, called approximate opacity preserving simulation relation, which characterizes how close two systems are in terms of the satisfaction of approximate opacity. This allows us to verify approximate opacity for large-scale, or even infinite systems, using their abstractions. We also discuss how to construct approximate opacity preserving symbolic models for a class of discrete-time control systems. Our results extend the definitions and analysis techniques for opacity from non-metric systems to metric systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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