Safety architecture patterns provide knowledge about large scale design decisions for safety-critical systems. They provide good ways to avoid, detect, and handle faults in software or hardware. In this paper we revise existing architectural safety patterns and organize them to build up a pattern system. We add Goal Structuring Notation diagrams to the patterns to provide a structured overview of their architectural decisions. Based on these diagrams we analyze and present relationships between the patterns. The diagrams can also be used to argue about a systems's safety, which we show with an example.
Abstract-The increasing connectivity of embedded systems requires more attention to security aspects. Security should not be post-engineered to a system, but should already be considered during system design. However, especially during early design phases it is difficult to judge the impact of high level design decisions, such as the decision for an overall system architecture, on security.To provide guidance for the system architecture selection for safety-related systems, we propose a quantitative security assessment method based on the application of design patterns. Based on security threats included in the patters, we calculate a security metric to estimate the patterns' security influence for a specific system. We describe the calculation and application of the proposed security metric with an industrial case study.
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