Services are usually developed and deployed independently; and systems can be formed by composing relevant services to achieve set goals. In such an open and dynamic environment, s...
WS-* specifications cover a variety of issues ranging from security and reliability to transaction support in web services. However, these specifications do not address web servic...
Software systems are increasingly being built as compositions of reusable artifacts (components, frameworks, toolkits, plug-ins, APIs, etc) that have non-trivial usage constraints...
Existing mandatory access control systems for operating systems are difficult to use. We identify several principles for designing usable access control systems and introduce the...
We study the access control integration problem for web services. Organizations frequently use many services, each with its own access control policies, that must interoperate whi...