Gärtner, StefanRuhroth, ThomasBürger, JensSchneider, KurtJürjens, JanAßmann, UweDemuth, BirgitSpitta, ThorstenPüschel, GeorgKaiser, Ronny2017-06-302017-06-302015978-3-88579-633-6Modern information systems are increasingly complex and need to operate in evolving environments. As a consequence, systems must co-evolve to keep up-todate with their environments. This is especially important for security properties, since changes and patches tend to compromise them. We propose a security assessment approach for natural language requirements for systematic co-evolution. Our evaluation and tool implementation show security benefits for maintaining long-living systems.enText/Conference Paper1617-5468