Warns, TimoCremers, Armin B.Manthey, RainerMartini, PeterSteinhage, Volker2019-10-112019-10-1120053-88579-396-2https://dl.gi.de/handle/20.500.12116/28070Intrusion tolerance is a recent approach to deal with intentional and malicious failures. It combines the research on fault tolerance with the research on security, and relies on the means of proactive security. The development of a fault-tolerant system requires the explication of its underlying fault assumptions. In this context, we propose a viewpoint on faults that discriminates whether they are timely exploitable and, therefore, are not covered by proactive security.enText/Conference Paper1617-5468