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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