Devant la commission d’examen composée de:

Offre de service dans les réseaux de nouvelle génération: Négociation sécurisée d’un niveau de service de bout en bout couvrant la qualité de service et la sécurité iv Based on the IP technology, the next generation networks (NGN) must overcome the main drawbacks of this technology consisting in the lack of quality of service (QoS), security and mobility management. To ensure a service offer in an NGN, a protocol for negotiating a service level can be used. However, most of the existing negotiation protocols allow the establishment of a service level which includes only QoS. As for security and mobility, they were often not covered by these negotiations, and therefore managed independently. However, securing a service can cause degradation of the QoS, and the mobility of a user can change the service needs in terms of QoS and security. Thus, we need to simultaneously manage QoS and security while taking into account user’s mobility. In this context, we rely on a QoS signaling protocol, called SLNP, in order to propose a mechanism that allows fixed and mobile users to negotiate a service level covering bot