  Security Policies (SP) constitute the core of communication networks
protection infrastructures. It offers a set of rules allowing differentiating
between legitimate actions and prohibited ones and consequently, associates
each entity in the network with a set of permissions and privileges. Moreover,
in today's technological society and to allow applications perpetuity,
communication networks must support the collaboration between entities to face
up any unavailability or flinching. This collaboration must be governed by
security mechanisms according to the established permissions and privileges.
Delegation is a common practice that is used to simplify the sharing of
responsibilities and privileges. The delegation process in a SP environment can
be implanted through the use of adequate formalisms and modeling. The main
contribution of this paper is then, the proposition of a generic and formal
modeling of delegation process. This modeling is based on three steps composing
the delegation life cycle: negotiation used for delegation initiation,
verification of the SP respect while delegating and revocation of an
established delegation. Hence, we propose to deal with each step according to
the main delegation characteristics and extend them by some new specificities.
