An Evaluation of Delegation Strategies for Coordinated Enforcement


The concept of service automata, introduced by Gay, Mantel and Sprick
in 2011, can be used to enforce usage control in a distributed system.
As the subjects in such a system communicate with each other, the
runtime enforcers (service automata) are given the same capability by
being able to delegate enforcement decisions to other automata.
Obviously there are mutiple strategies for doing so, each with their
respective advantages and disadvantages. By using the example scenario
of mail forwarding different delegation strategies are presented and
evaluated that can be used as part of a service automata implementation
to prevent forwarding of an e-mail in a closed and monitored system of
e-mail users.
The presentation sketches the contents of the thesis by presenting the 
model used for evaluation, different strategies and results.