نبذة مختصرة : Ces travaux ont été réalisés dans le cadre d'une co-tutelle de thèse entre l'Université de Nantes et l'Université Libanaise. ; IP multicast is supported in the next generation of satellite systems implementing DVB-S (Digital Video Broadcasting via Satellite). In this type of communication, security, switching and scalability are the main challenges. In this context, we propose a new multicast security system based on: an enhanced ULE encapsulation standard, method which can operate with the switching approaches ‘label or self-switching’ to ensure efficient filtering and multicast forwarding, a highly flexible security mechanism, and a scalable key management scheme with two LKH (Logical Key Hierarchy) layers. The usage of chaos is proposed for the new keys generation and data encryption. The analysis of the proposed system shows that it can handle a large number of members in a secure and efficient manner with minimal bandwidth consumption.Security in the 4th generation of mobile networks EPS is considered very robust. However, weaknesses inherited from UMTS and others identified in the specialized literature remain without effective treatment. These vulnerabilities affect precisely the authentication and key agreement protocol, EPS-AKA. Several protocols have been proposed to resolve these problems but without a significant success. In this context, we propose a new protocol called FP-AKA which provides a strong protection against the different attacks with minimal cost. The comparison of FP-AKA with the best existing protocols in the literature (SE-AKA, EC-AKA,.) shows the superiority of FP-AKA in several parameters (security, cost, delay,.). ; IP Multicast est supporté dans la nouvelle génération des systèmes satellitaires implémentant DVB-S (Digital Video Broadcasting via satellite). Dans ce type de communication, la sécurité, la commutation, et l’évolutivité sont les principaux défis. A ce propos, nous proposons un nouveau système de sécurité multicast basé sur : une méthode d’encapsulation améliorée du ...
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