Towards a credential-based implementation of compound access control policies. - Joachim Biskup; Sandra Wortmann (SACMAT, 2004)

Dynamically Changing Trust Structure in Capability Based Access Control Systems. - Sandra Wortmann; Barbara Sprick; Christoph Kobusch (TrustBus, 2004)

Time dependent trust structures. - Barbara Sprick; Sandra Wortmann (Comput. Syst. Sci. Eng., 2005)

Towards Secure Execution Orders for CompositeWeb Services. - Joachim Biskup; Barbara Carminati; Elena Ferrari 001; Frank Müller; Sandra Wortmann (ICWS, 2007)

A Trust- and Property-based Access Control Model. - Joachim Biskup; Julia Hielscher; Sandra Wortmann (STM@ESORICS, 2007)

Ansätze kompositionaler und zustandsbasierter Zugriffskontrolle für Web-basierte Umgebungen. - Sandra Wortmann (2013)