Modeling Security Aspects in Safety Environment Evzudin Ugljesa1, Hans-Dieter Wacker2, and Josef Börcsök3 1, 3University of Kassel, 34121 Kassel, Germany 2HIMA, 68782 Bruehl, Germany e.ugljesa@uni-kassel.de, h.wacker@hima.com, j.boercsoek@uni-kassel.de Abstract High product adaptivity and availability, flexibility, reliability and robustness, at reduced cost and time-to- market, result in an ever-increasing number of products and complexity containing embedded software for safety critical systems. These complexities, controlled and operated by inexperienced users will attract criminals. In this issue we describe a model approach for assessing the conditional probability of security failures - based on safety-intrusion – given the occurrence of reliability failures on safety-related systems like the 2oo4-Architecture.