Abstract
The recent proliferation of embedded cyber components in modern physical systems [1] has generated a variety of new security risks which threaten not only cyberspace, but our physical environment as well. Whereas earlier security threats resided primarily in cyberspace, the increasing marriage of digital technology with mechanical systems in cyber-physical systems (CPS), suggests the need for more advanced generalized CPS security measures. To address this problem, in this paper we consider the first step toward an improved security model: detecting the security attack. Using logical truth tables, we have developed a generalized algorithm for intrusion detection in CPS for systems which can be defined over discrete set of valued states. Additionally, a robustness algorithm is given which determines the level of security of a discrete-valued CPS against varying combinations of multiple signal alterations. These algorithms, when coupled with encryption keys which disallow multiple signal alteration, provide for a generalized security methodology for both cyber-security and cyber-physical systems.Copyright for articles published in this journal is retained by the authors, with first publication rights granted to Vanderbilt Undergraduate Research Journal under a Creative Commons Attribution-Noncommercial-ShareAlike 4.0 International License (linked here). By virtue of their appearance in this open access journal, articles are available for wide dissemination at no cost to readers, with proper attribution (acknowledgment of the work's authorship and initial publication in this journal), in educational and other non-commercial settings. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process.
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