Collaborative environments raise major challenges to secure them. These challenges increase when it comes to the domain of Enterprise-Social-Networks (ESNs) as ESNs aim to incorporate the social technologies in an organization setup while asserting greater control of information security. In this context, the security challenges have taken a new shape as an ESN may not be limited to the boundaries of a single organization and users from different organizations can collaborate in a common federated environment. In this paper, we address the problem of the authorization's delegation in federated collaborative environments like ESNs. In contrast to traditional XML based languages, such as XACML, our approach is based on event-calculus, a temporal logic programming formalism. Further, the traditional approaches are either user-centric or organization-centric. However, the domain of ESN requires to bridge the gap between them and the proposed framework deals with this challenge. In order to enhance the delegation scheme, we have proposed a behavior monitoring mechanism, that permits to assess principals' trust level within the federated collaborative environment. We evaluate our trust computing approach based on simulated principals' behaviors and discuss the obtained results.

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{{Explor lien
   |wiki=    Wicri/Lorraine
   |area=    InforLorV4
   |flux=    Main
   |étape=   Exploration
   |type=    RBID
   |clé=     Hal:hal-01240387
   |texte=   Trust-Based Formal Delegation Framework for Enterprise Social Networks
}}