This work addresses the inherent lack of control and trust in Multi-Party Systems at the
examples of the Database-as-a-Service (DaaS) scenario and public Distributed Hash Tables
(DHTs). In the DaaS field it is shown how confidential information in a database can be
protected while still allowing the external storage provider to process incoming queries. For
public DHTs it is shown how these highly dynamic systems can be managed by facilitating
monitoring simulation and self-adaptation.
