Montagut, Frederic (2007) Processus collaboratifs ubiquitaires: architecture, fiabilite et securite. PhD thesis Informatique et reseaux, Eurecom, ENST p.222.

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Abstract

Electronic commerce applications have become the standard support for B2B and B2C collaborations. The concept of workflow has been the main enabler concept for such applications. Workflow technologies indeed make it possible to leverage the functionalities of multiple service providers to build value-added services. Typical workflows however rely on a centralized coordinator in charge of managing the workflow execution. New trends in collaborative business applications however call for more flexibility. As a result, the centralized coordination paradigm is no longer suitable to adequately support the execution of recent business applications. In this thesis we present a decentralized workflow management system to overcome this limitation.

The main contribution of this thesis is the design and implementation of a full-fledged distributed workflow management system. The workflow architecture that we developed supports the execution of workflows in environments whereby resources offered by each business partner can be used by any party within the surroundings of that business partner. It also features the runtime assignment of business partners to workflow tasks to provide the adequate flexibility to support dynamic collaborations of business partners. This flexibility however comes at the expense of security and reliability and raises new research issues as opposed to usual workflow systems in terms of security and fault management. To cope with the latter, we first propose a transactional protocol to support the workflow execution. Besides, we introduce new security mechanisms to assure the integrity of the workflow execution and to prevent workflow instance forging.

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