Over the past several years, with the advent of the Open Grid Services Architecture (OGSA) [10] and the Web Services Resource Framework (WSRF) [14], Service-Oriented Architectures...
The term "Web 2.0" is used to describe applications that distinguish themselves from previous generations of software by a number of principles. Existing work shows that...
Single sign-on is critical for the usability of distributed systems. While there are several authentication mechanisms which support single sign-on (e.g. Kerberos and X.509), it m...
Services can be characterized as activities in which providers and customers co-create value. The need for a tight collaboration between providers and customers is thus an importa...
State-of-the-art security mechanisms are often enforced in isolation from each other, which limits the kinds of policies that can be enforced in distributed and heterogeneous sett...