Advanced

Simulation based assessment of resilience of two large-scale socio-technical IT networks

Landegren, Finn LU ; Höst, Martin LU and Möller, Peter LU (2018) In International Journal of Critical Infrastructure Protection 23. p.112-125
Abstract

Most sectors of modern society are currently undergoing rapid digitalization. With the progress of this development IT networks are becoming an ever more crucial asset whose failure are prone to cause economic losses and risks to health and safety of the population. Due to this development, it is increasingly important that IT networks are designed to be resilient, meaning that they either maintain or quickly recover their functionality when exposed to strains of various kinds. Simulation-based methods that consider supply network topology as well as system for repairing the supply network have previously been applied and found to be useful for assessment of resilience of electricity and water networks. A method of this kind is here... (More)

Most sectors of modern society are currently undergoing rapid digitalization. With the progress of this development IT networks are becoming an ever more crucial asset whose failure are prone to cause economic losses and risks to health and safety of the population. Due to this development, it is increasingly important that IT networks are designed to be resilient, meaning that they either maintain or quickly recover their functionality when exposed to strains of various kinds. Simulation-based methods that consider supply network topology as well as system for repairing the supply network have previously been applied and found to be useful for assessment of resilience of electricity and water networks. A method of this kind is here applied for IT networks. The method, however, considers only hardware and operator fault modes, not software and dependency faults. The IT networks are studied as socio-technical systems, here broadly understood as systems whose functionality depend on technical as well as organizational sub-systems. The aim of the present paper is to investigate if the method is applicable for assessment of resilience of large-scale IT networks that are critical to society, meaning that (1) it is possible to apply for such systems based on available data, in this case gathered mainly through interviews with focus groups, (2) the results are relevant for users/maintainers/owners of these systems and (3) it captures all relevant factors. The method is tested in case studies on the IT network of a municipality and the SCADA system of a wastewater network. Follow-up interviews were conducted with system managers to assess the perceived relevance of the method and results. It is concluded that the method can be used to obtain the resilience metrics sought for and that the method enables system owners to see if and for what levels of strain they are presently reaching their desired targets concerning system resilience. Follow-up interviews also indicate that the method is perceived by the system managers as being able to support decision making concerning improvement in system resilience.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Critical infrastructure, IT network, Rapidity, Resilience, Robustness, SCADA system, Simulation, Socio-technical system
in
International Journal of Critical Infrastructure Protection
volume
23
pages
112 - 125
external identifiers
  • scopus:85052947959
ISSN
1874-5482
DOI
10.1016/j.ijcip.2018.08.003
language
English
LU publication?
yes
id
a0070dac-3147-480f-9ec3-7b317c74b9df
date added to LUP
2018-10-22 12:24:03
date last changed
2019-02-20 11:32:39
@article{a0070dac-3147-480f-9ec3-7b317c74b9df,
  abstract     = {<p>Most sectors of modern society are currently undergoing rapid digitalization. With the progress of this development IT networks are becoming an ever more crucial asset whose failure are prone to cause economic losses and risks to health and safety of the population. Due to this development, it is increasingly important that IT networks are designed to be resilient, meaning that they either maintain or quickly recover their functionality when exposed to strains of various kinds. Simulation-based methods that consider supply network topology as well as system for repairing the supply network have previously been applied and found to be useful for assessment of resilience of electricity and water networks. A method of this kind is here applied for IT networks. The method, however, considers only hardware and operator fault modes, not software and dependency faults. The IT networks are studied as socio-technical systems, here broadly understood as systems whose functionality depend on technical as well as organizational sub-systems. The aim of the present paper is to investigate if the method is applicable for assessment of resilience of large-scale IT networks that are critical to society, meaning that (1) it is possible to apply for such systems based on available data, in this case gathered mainly through interviews with focus groups, (2) the results are relevant for users/maintainers/owners of these systems and (3) it captures all relevant factors. The method is tested in case studies on the IT network of a municipality and the SCADA system of a wastewater network. Follow-up interviews were conducted with system managers to assess the perceived relevance of the method and results. It is concluded that the method can be used to obtain the resilience metrics sought for and that the method enables system owners to see if and for what levels of strain they are presently reaching their desired targets concerning system resilience. Follow-up interviews also indicate that the method is perceived by the system managers as being able to support decision making concerning improvement in system resilience.</p>},
  author       = {Landegren, Finn and Höst, Martin and Möller, Peter},
  issn         = {1874-5482},
  keyword      = {Critical infrastructure,IT network,Rapidity,Resilience,Robustness,SCADA system,Simulation,Socio-technical system},
  language     = {eng},
  pages        = {112--125},
  series       = {International Journal of Critical Infrastructure Protection},
  title        = {Simulation based assessment of resilience of two large-scale socio-technical IT networks},
  url          = {http://dx.doi.org/10.1016/j.ijcip.2018.08.003},
  volume       = {23},
  year         = {2018},
}