Integrated Attack Tree in Residual Risk Management Framework

Safety-critical cyber-physical systems (CPSs), such as high-tech cars having cyber capabilities, are highly interconnected. Automotive manufacturers are concerned about cyber attacks on vehicles that can lead to catastrophic consequences. There is a need for a new risk management approach to address and investigate cybersecurity risks. Risk management in the automotive domain is challenging due to technological improvements and advances every year. The current standard for automotive security is ISO/SAE 21434, which discusses a framework that includes threats, associated risks, and risk treatment options such as risk reduction by applying appropriate defences. This paper presents a residual cybersecurity risk management framework aligned with the framework presented in ISO/SAE 21434. A methodology is proposed to develop an integrated attack tree that considers multiple sub-systems within the CPS. Integrating attack trees in this way will help the analyst to take a broad perspective of system security. Our previous approach utilises a flow graph to calculate the residual risk to a system before and after applying defences. This paper is an extension of our initial work. It defines the steps for applying the proposed framework and using adaptive cruise control (ACC) and adaptive light control (ALC) to illustrate the applicability of our work. This work is evaluated by comparing it with the requirements of the risk management framework discussed in the literature. Currently, our methodology satisfies more than 75% of their requirements

TOMSAC - Methodology for trade-off management between automotive safety and cyber security

Safety and security interdependencies have been of interest for researchers for several decades. However, in practice, they are not given the necessary consideration yet due to various reasons, such as lack of understanding and reluctance to change current practices. This research is aimed at advancing the state of the art in this area by developing a practical, easy to adapt and to use methodology for managing interdependencies and trade-offs throughout the development lifetime of cyber physical systems. The methodology is named TOMSAC, short for Trade-Off Management between Safety And Cyber security

Graphs from <i>We</i>-T classification of diesel fuel droplet impact regimes

The data-sets of the graphs are given in .xls

Graphs from <i>We</i>-T classification of diesel fuel droplet impact regimes

The data-sets of the graphs are given in .xls