Web Services and the Grid allow distributed research teams to form dynamic, multi-institutional virtual organizations sharing high performance computing resources, large scale data sets and instruments for solving computationally intensive scientific applications, thereby forming Virtual Laboratories. This paper aims at exploring security issues of such distributed scientific laboratories and t...

Business process management is tightly coupled with serviceoriented architecture, as business processes orchestrate services for business collaboration at logical level. Given the complexity of business processes and the variety of users, it is a sought-after feature to show a business process with different views, so as to cater for the diverse interests, authority levels, etc., of users. This...

We investigate the problem of WS-BPEL processes resiliency in RBAC-WS-BPEL, an authorization model for WS-BPEL that supports the specification of authorizations for the execution of WS-BPEL process activities by roles and users and authorization constraints, such as separation and binding of duty. The goal of resiliency is to guarantee that even if some users becomes unavailable during the exec...

The WS-BPEL 2.0 specification [WS-BPEL 2.0] provides a language for formally describing business processes and business interaction protocols. WS-BPEL was designed to extend the Web Services interaction model to support business transactions. The WS-BPEL Primer is a non-normative document intended to provide an easy to read explanation of the WS-BPEL 2.0 specification. The goal of this document...

The Business Process Execution Language BPEL4WS has emerged to introduce process dimension in Web Services coordination. At the same time, a lot of needs related to business process management appeared. In this article we focus on transactional management in Web Services platforms. WS-Transaction specification had a big impact on usage of Web Services in critical situations such as financial se...

This work proposes an extension to the WS-HumanTask architecture developed to provide support to the Resource Perspective of BPEL processes. The extension is aimed to overcome limitations identified in the support of BPEL4People and WS-HumanTask to recurrent Resource Perspective requirements described by the Workflow Resource Patterns and well known reference models of workflow management syste...

A known weakness of Web Services is their vulnerability to Denial of Service attacks exploiting XML processing characteristics. To protect Web Services from these attacks, extended validation of SOAP messages—considering WS-Security and WS-SecurityPolicy—is made. For SOAP security is message oriented, the processing of the security content itself is vulnerable to Denial of Service attacks. Henc...

Problem statement: Metering and charging are basic accounting functions that are essential for commercial usage of web services. Current charging and accounting schemes primarily involve users being charged flat or based on the connection/session time. Accounting management of web services should provide for metering, charging, accounting, billing, payment and auditing. We have extended our ear...

One of the most important features of XML-based Web services is that they can be easily accessed over the Internet, but this makes them vulnerable to a series of security threats. What makes security for web services so challenging is their distributed and heterogeneous nature. Access control policy specification for controlling access to Web services is then becoming an emergent research area ...

Recently, there have been a number of proposals for languages for expressing web service constraints and capabilities, with WSPolicy and WSPL leading the way. The proposed languages, although relatively inexpressive, suffer from a lack of formal semantics. In this paper, we provide a mapping of WS-Policy to the description logic fragment species of the Web Ontology Language (OWL-DL), and descri...