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Documents authored by Nadjm-Tehrani, Simin

Document
DOI: 10.4230/DagRep.12.4.54
Digital Twins for Cyber-Physical Systems Security (Dagstuhl Seminar 22171)

Authors: Alvaro Cárdenas Mora, Simin Nadjm-Tehrani, Edgar Weippl, and Matthias Eckhart

Published in: Dagstuhl Reports, Volume 12, Issue 4 (2022)

Abstract
Cyber-physical systems (CPSs) may constitute an attractive attack target due to the increased networking of components that yields an expanded attack surface. If their physical control capabilities are compromised, safety implications may arise. Thus, it is vital that the CPSs being engineered are thoroughly tested and that adequate response measures can be realized upon detecting intruders during operation. However, security testing is hard to conduct due to expensive hardware, limited maintenance periods, and safety risks. Furthermore, the increased stealthiness of threat actors requires new intrusion detection and response methods. Interestingly, digital twins have become an important concept in industrial informatics to solve similar problems, yet with a non-security-related focus: Digital twins that virtually replicate the real systems provide cost-efficient modeling, testing, monitoring, and even predictive capabilities. However, until recently, the digital-twin concept has mainly focused on production optimizations or design improvements without considering its potential for CPS security. The Dagstuhl Seminar 22171 "Digital Twins for Cyber-Physical Systems Security" therefore aimed to serve as an interdisciplinary, open knowledge-sharing platform to investigate the benefits and challenges of applying the digital-twin concept to improve the security of CPSs.
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Alvaro Cárdenas Mora, Simin Nadjm-Tehrani, Edgar Weippl, and Matthias Eckhart. Digital Twins for Cyber-Physical Systems Security (Dagstuhl Seminar 22171). In Dagstuhl Reports, Volume 12, Issue 4, pp. 54-71, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@Article{mora_et_al:DagRep.12.4.54,
  author =	{Mora, Alvaro C\'{a}rdenas and Nadjm-Tehrani, Simin and Weippl, Edgar and Eckhart, Matthias},
  title =	{{Digital Twins for Cyber-Physical Systems Security (Dagstuhl Seminar 22171)}},
  pages =	{54--71},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2022},
  volume =	{12},
  number =	{4},
  editor =	{Mora, Alvaro C\'{a}rdenas and Nadjm-Tehrani, Simin and Weippl, Edgar and Eckhart, Matthias},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.12.4.54},
  URN =		{urn:nbn:de:0030-drops-172805},
  doi =		{10.4230/DagRep.12.4.54},
  annote =	{Keywords: cyber-physical systems, digital twins, information security, production systems engineering, SCADA, industrial control systems, Industry 4.0}
}
Document
DOI: 10.4230/OASIcs.WCET.2016.12
Understanding Shared Memory Bank Access Interference in Multi-Core Avionics

Authors: Andreas Löfwenmark and Simin Nadjm-Tehrani

Published in: OASIcs, Volume 55, 16th International Workshop on Worst-Case Execution Time Analysis (WCET 2016)

Abstract
Deployment of multi-core platforms in safety-critical applications requires reliable estimation of worst-case response time (WCRT) for critical processes. Determination of WCRT needs to accurately estimate and measure the interferences arising from multiple processes and multiple cores. Earlier works have proposed frameworks in which CPU, shared cache, and shared memory (DRAM) interferences can be estimated using some application and platform-dependent parameters. In this work we examine a recent work in which single core equivalent (SCE) worst case execution time is used as a basis for deriving WCRT. We describe the specific requirements in an avionics context including the sharing of memory banks by multiple processes on multiple cores, and adapt the SCE framework to account for them. We present the needed adaptations to a real-time operating system to enforce the requirements, and present a methodology for validating the theoretical WCRT through measurements on the resulting platform. The work reveals that the framework indeed creates a (pessimistic) bound on the WCRT. It also discloses that the maximum interference for memory accesses does not arise when all cores share the same memory bank.
Cite as

Andreas Löfwenmark and Simin Nadjm-Tehrani. Understanding Shared Memory Bank Access Interference in Multi-Core Avionics. In 16th International Workshop on Worst-Case Execution Time Analysis (WCET 2016). Open Access Series in Informatics (OASIcs), Volume 55, pp. 12:1-12:11, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2016)

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@InProceedings{lofwenmark_et_al:OASIcs.WCET.2016.12,
  author =	{L\"{o}fwenmark, Andreas and Nadjm-Tehrani, Simin},
  title =	{{Understanding Shared Memory Bank Access Interference in Multi-Core Avionics}},
  booktitle =	{16th International Workshop on Worst-Case Execution Time Analysis (WCET 2016)},
  pages =	{12:1--12:11},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-025-5},
  ISSN =	{2190-6807},
  year =	{2016},
  volume =	{55},
  editor =	{Schoeberl, Martin},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.WCET.2016.12},
  URN =		{urn:nbn:de:0030-drops-69051},
  doi =		{10.4230/OASIcs.WCET.2016.12},
  annote =	{Keywords: multi-core, avionics, shared memory systems, WCET}
}
Document
DOI: 10.4230/DagSemProc.09201.8
Wheels within Wheels: Making Fault Management Cost-Effective

Authors: Moises Goldszmidt, Miroslaw Malek, Simin Nadjm-Tehrani, Priya Narasimhan, Felix Salfner, Paul A.S. Ward, and John Wilkes

Published in: Dagstuhl Seminar Proceedings, Volume 9201, Self-Healing and Self-Adaptive Systems (2009)

Abstract
Local design and optimization of the components of a fault management system results in sub-optimal decisions. This means that the target system will likely not meet its objectives (under-performs) or cost too much if conditions, objectives, or constraints change. We can fix this by applying a nested, management system for the fault-management system itself. We believe that doing so will produce a more resilient, self-aware, system that can operate more effectively across a wider range of conditions, and provide better behavior at closer to optimal cost. This document summarizes the results of the Working Group 7 - ``Cost-Effective Fault Management'' - at the Dagstuhl Seminar 09201 ``Self-Healing and Self-Adaptive Systems'' (organized by A. Andrzejak, K. Geihs, O. Shehory and J. Wilkes). The seminar was held from May 10th 2009 to May 15th 2009 in Schloss Dagstuhl~--~Leibniz Center for Informatics.
Cite as

Moises Goldszmidt, Miroslaw Malek, Simin Nadjm-Tehrani, Priya Narasimhan, Felix Salfner, Paul A.S. Ward, and John Wilkes. Wheels within Wheels: Making Fault Management Cost-Effective. In Self-Healing and Self-Adaptive Systems. Dagstuhl Seminar Proceedings, Volume 9201, pp. 1-6, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{goldszmidt_et_al:DagSemProc.09201.8,
  author =	{Goldszmidt, Moises and Malek, Miroslaw and Nadjm-Tehrani, Simin and Narasimhan, Priya and Salfner, Felix and Ward, Paul A.S. and Wilkes, John},
  title =	{{Wheels within Wheels: Making Fault Management Cost-Effective}},
  booktitle =	{Self-Healing and Self-Adaptive Systems},
  pages =	{1--6},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9201},
  editor =	{Artur Andrzejak and Kurt Geihs and Onn Shehory and John Wilkes},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09201.8},
  URN =		{urn:nbn:de:0030-drops-21029},
  doi =		{10.4230/DagSemProc.09201.8},
  annote =	{Keywords: Fault management, cost-effectiveness}
}
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