Jakub Dziwisz(1) and Kuba Rozkwitalski(2)
             (1) ACC CYFRONET AGH
             (2) GridwiseTech

       Virtual Organisations for Open Grids and  Shibboleth

Security in grid computing has recently become a more and more
important subject. This is due to at least two reasons. The first
one is the adoption of grid solutions in a commercial environment
where security is an issue of utmost importance. The other one is the
fact that grids are becoming very complex systems as they federate
resources from a large number of administrative domains. Traditional
approaches are inadequate and there is a demand for new paradigms and
solutions for grid security results in a significant. Very often
experts in VO cannot reach an agreement, not to mention regular
users.

In this lecture we aim to describe new challenges for grid security
and to present  the most promising concepts and solutions in this
area.
One of the most interesting solution is Shibboleth, and therefore
it  will be described in details. Shibboleth is a middleware package
enabling inter-institutional Single-Sign-On. It allows sites to make
informed authorization decisions based on attributes for individual
access of protected online resources in a privacy-preserving manner.
Pros and cons will be discussed as well as examples of real-world
application. The lecture will be concluded by some remarks on further
improvements to the framework.