Ma, ChunyanConcepcion, ArturoAbramowicz, WitoldMayr, Heinrich C.2019-08-122019-08-1220062-88579-179-Xhttps://dl.gi.de/handle/20.500.12116/24163In this paper, we propose a mathematical model for evaluating the security of multi-agent distributed systems. Using the developed security risk graph to model the system's vulnerabilities, the transition time on the shortest path between two vertices can be calculated to evaluate the estimated breach time. The diameter of the system is used to represent the security measure of the entire system. Thus, the security level of different systems can be compared.enText/Conference Paper1617-5468