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Addressing dependability by applying an approach for model-based risk assessment

机译：通过应用基于模型的风险评估方法来解决可靠性

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摘要

This paper describes how an approach for model-based risk assessment (MBRA) can be applied for addressing different dependability factors in a critical application. Dependability factors, such as availability, reliability, safety and security, are important when assessing the dependability degree of total systems involving digital instrumentation and control (I&C) sub-systems. In order to identify risk sources their roles with regard to intentional system aspects such as system functions, component behaviours and intercommunications must be clarified. Traditional risk assessment is based on fault or risk models of the system. In contrast to this, MBRA utilizes success-oriented models describing all intended system aspects, including functional, operational and organizational aspects of the target. The EU-funded CORAS project developed a tool-supported methodology for the application of MBRA in security-critical systems. The methodology has been tried out within the telemedicine and e-commerce areas, and provided through a series of seven trials a sound basis for risk assessments. In this paper the results from the CORAS project are presented, and it is discussed how the approach for applying MBRA meets the needs of a risk-informed Man-Technology-Organization (MTO) model, and how methodology can be applied as a part of a trust case development.
机译：本文介绍了如何将基于模型的风险评估（MBRA）方法应用于关键应用中的不同可靠性因素。当评估涉及数字仪表和控制（I＆C）子系统的整个系统的可靠性程度时，诸如可用性，可靠性，安全性和安全性之类的可靠性因素很重要。为了确定风险源，必须明确其在故意系统方面（例如系统功能，组件行为和内部通信）的作用。传统的风险评估基于系统的故障或风险模型。与此相反，MBRA利用面向成功的模型来描述所有预期的系统方面，包括目标的功能，运营和组织方面。欧盟资助的CORAS项目开发了一种工具支持的方法，用于将MBRA应用于安全关键型系统。该方法已在远程医疗和电子商务领域进行了尝试，并通过一系列七个试验为风险评估提供了良好的基础。在本文中，将介绍CORAS项目的结果，并讨论了应用MBRA的方法如何满足风险告知的人-技术-组织（MTO）模型的需求，以及如何将方法作为方法的一部分应用信任案例开发。

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