Jackie Hallberg

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Security assessment is a central ability in the striving for adequate levels of IT security in information systems and networks. In this paper, the issue of system-wide IT security assessment is addressed. The results include a framework for IT security assessment addressing the need to include the influence of system structure in assessments. The purpose(More)
A networked defense, and the networked information society, requires both trustworthy information systems and that users and societies trust these systems. Since the trustworthiness of systems depends on the level of IT security, the ability to assess the IT security ability is vital. Currently, there are no efficient methods for establishing the level of(More)
A numerical model is being constructed to simulate the movement of water and constituents within a coupled groundwater and surface water system. The model is designed to run on all DoD HPC platforms. Local mesh refinement and coarsening and domain-decomposition preconditioners have been integrated into the model. The model has been exercised successfully on(More)
This paper presents an approach for extracting security requirements from early design specifications. An increasing part of the communication and sharing of information in our society utilizes electronic media. Many organizations, especially distributed and Net-centric, are entirely dependent on well functioning information systems. Thus, IT security is(More)
In this paper we discuss the design and implementation of a Newton-Krylov-Schwarz solver for the implicit temporal integration on an unstructured three-dimensional spatial mesh of Richards' equation for groundwater flow in unsaturated porous media. We use aggregation techniques from the algebraic multigrid literature to construct a coarse mesh for two-level(More)
The abundance of security threats makes IT security a prerequisite for the use of information technology (IT). Striving for appropriate security, costs for IT security controls should be related to their impact on the level of IT security. This requires the level of IT security to be assessed. However, this insight is to general to guide the design of(More)
A numerical model is being constructed to simulate the movement of water and constituents within a coupled groundwater and surface water system. The model is designed to run on all DoD HPC platforms. Local mesh refinement and coarsening and domain-decomposition preconditioners have been integrated into the model. The model has been exercised successfully on(More)
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