Security Modeling for Embedded System Design

Among the many recent cyber attacks, the Mirai botnet DDOS attacks were carried out using infected IoTs. To prevent our connected devices from being thus compromised, their security vulnerabilities should be detected and mitigated early. This paper presents how the SysML-Sec Methodology has been enhanced for the evolving graphical modeling of security through the three stages of our embedded system design methodology: Analysis, HW/SW Partitioning, and Software Analysis. The security requirements and attack graphs generated during the Analysis phase determine the sensitive data and attacker model during the HW/SW Partitioning phase. We then accordingly generate a secured model with communication protection modeled using abstract security representations, which can then be translated into a Software/System Design Model. The Software Model is intended as the final detailed model of the system. Throughout the design process, formal verification and simulation evaluate safety, security, and performance of the system.