Candidate security solutions for TTEthernet

TTEthernet is a communication platform for mixed-criticality systems, which are systems capable of hosting applications with differing criticality requirements. For example, one use case of TTEthernet is the communication bus for distributed Integrated Modular Avionics (IMA) systems. As of today, criticality in TTEthernet scales along two dimensions: time criticality and safety criticality. While certain safety mechanisms directly contribute also to achieving specific security goals, e.g., to exclude the possibility of Denial of Service (DoS) attacks, security as another dimension of scale needs yet to be introduced into the TTEthernet platform. In this paper we discuss security threats relevant to TTEthernet and describe how some of them are addressed by TTEthernet already today. For the remaining threats we identify candidate security extensions. As TTEthernet is a cross-industry technology particular care needs to be taken to find a good balance between generic applicability.