NDLI: Modelling user availability in workflow resiliency analysis

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Modelling user availability in workflow resiliency analysis

Content Provider	ACM Digital Library
Author	Morisset, Charles Mace, John C. van Moorsel, Aad
Abstract	Workflows capture complex operational processes and include security constraints limiting which users can perform which tasks. An improper security policy may prevent certain tasks being assigned and may force a policy violation. Deciding whether a valid user-task assignment exists for a given policy is known to be extremely complex, especially when considering user unavailability (known as the resiliency problem). Therefore tools are required that allow automatic evaluation of workflow resiliency. Modelling well defined workflows is fairly straightforward, however user availability can be modelled in multiple ways for the same workflow. Correct choice of model is a complex yet necessary concern as it has a major impact on the calculated resiliency. We describe a number of user availability models and their encoding in the model checker PRISM, used to evaluate resiliency. We also show how model choice can affect resiliency computation in terms of its value, memory and CPU time.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISBN	9781450333764
DOI	10.1145/2746194.2746201
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-04-21
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Markov decision process Probabilistic model checker Workflow satisfiability problem
Content Type	Text
Resource Type	Article

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