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    Associate Professor

    Université Henri Poincaré, Nancy

    A Secure Task Delegation Model for Workflows

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    Workflow management systems provide some of the required technical means to preserve integrity, confidentiality and availability at the control-, data- and task assignment layers of a workflow. We currently observe a move away from predefined strict workflow enforcement approaches towards supporting exceptions which are difficult to foresee when modelling a workflow. One specific approach for exception handling is that of task delegation. The delegation of a task from one principal to another, however, has to be managed and executed in a secure way, in this context implying the presence of a fixed set of delegation events. In this paper, we propose first and foremost, a secure task delegation model within a workflow. The novel part of this model is separating the various aspects of delegation with regards tousers, tasks, events and data, portraying them in terms of a multi-layered state machine. We then define delegation scenarios and analyse additional requirements to support secure task delegation over these layers. Moreover, we detail a delegation protocol with a specific focus on the initial negotiation steps between the involved principals.

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    Description

    Title : A Secure Task Delegation Model for Workflows
    Author(s) : Khaled Gaaloul, Andreas Schaad, Ulrich Flegel, François Charoy
    Abstract : Workflow management systems provide some of the required technical means to preserve integrity, confidentiality and availability at the control-, data- and task assignment layers of a workflow. We currently observe a move away from predefined strict workflow enforcement approaches towards supporting exceptions which are difficult to foresee when modelling a workflow. One specific approach for exception handling is that of task delegation. The delegation of a task from one principal to another, however, has to be managed and executed in a secure way, in this context implying the presence of a fixed set of delegation events. In this paper, we propose first and foremost, a secure task delegation model within a workflow. The novel part of this model is separating the various aspects of delegation with regards tousers, tasks, events and data, portraying them in terms of a multi-layered state machine. We then define delegation scenarios and analyse additional requirements to support secure task delegation over these layers. Moreover, we detail a delegation protocol with a specific focus on the initial negotiation steps between the involved principals.
    Subject : unspecified
    Area : Other
    Language : English
    Year : 2008

    Affiliations Université Henri Poincaré, Nancy
    Journal : 2008 Second International Conference on Emerging Security Inform
    Volume : 2008
    Publisher : Ieee
    Pages : 10-15
    Url : http://hal.archives-ouvertes.fr/inria-00334755/PDF/gaaloul-SecureTaskDelegation.pdf
    Doi : 10.1109/SECURWARE.2008.21

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