Key distribution technique for IPTV services with support for admission control and user defined groups

Tese de doutoramento. Engenharia Electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 200

Session Management in Multicast

As a new network technique to efficiently distribute information from a small number of senders to large numbers of receivers, multicast encounters many problems in scalability, membership management, security, etc. These problems hinder the deployment of multicast technology in commercial applications. To overcome these problems, a more general solution for multicast technology is needed. In this paper, after studying current multicast technologies, we summarized the technical requirements for multicast, including data delivery, scalability, security, group management, reliability, and deployment. In order to understand and meet the requirements, we define a life cycle model that most multicast sessions should follow. According to the requirements and the life cycle model, we propose and design a general solution that can control each phase of a session and satisfy most requirements for multicast technology. This general solution has three parts: hierarchical topology auto-configuration algorithm, Session Management Mechanism, and techniques supporting different multicast protocols. To verify the feasibility of our solution and compare its performance with other multicast techniques, we simulate our solution and compare it with PIM-SM and ESM

Automated Key Management for Router Updates

Abstract—Security is assuming increasing importance in emerging networks. To ensure application security, the routing protocols are assumed to be trusted. Correct forwarding of pack-ets requires the prior exchange of information among routers, using the appropriate routing protocol. Valid construction of the routes requires that the exchanged information be received from a legitimate neighbor, and that it not be altered en route, i.e., the inter-router communication has to be secure. This requires, in turn, an architecture for managing the necessary security associations and keying material within an administrative region. After reviewing current work and existing security tools, a proposal is made for a novel architecture to manage the router updates. The operations within this architecture are detailed, and its advantages are explained. Index Terms—Routing; Security; Key Management I

IP ROUTING AND KEY MANAGEMENT FOR SECURE MULTICAST IN SATELLITE ATM NETWORKS

Communication satellites offer an efficient way to extend IP multicast services for groups in wide-area networks. This poses interesting challenges for routing and security. Satellite networks can have wired and wireless links and different link-layer technologies like Ethernet and ATM. For security, the multicast traffic should be restricted to legitimate receivers, which can be achieved by data encryption.This requires secure and efficient methods to manage the encryption keys. This thesis attempts to solve the above problems for secure multicast in wide-area networks that have Ethernet LANs interconnected by ATM-based satellite channels. The thesis reviews the multicast services offered by IP and ATM and proposes a multicast routing framework for hybrid satellite networks. The thesis also investigates current group key management protocols, and designs a scheme for secure and scalable key management for the proposed multicast architecture. The various proposed schemes are presented in detail, alongwith analysis and simulation results

Development of a multicast routing protocol for low power and lossy networks

The Internet of things (IoT) is a new paradigm that has been gaining popularity in recent years. As the name "Internet of things" suggests, things surrounding us will be able to interact with each other and also connect to the Internet, thus forming a worldwide network of connected objects. The number of potential applications of this concept is huge and indudes various domains such as home environment, transportation, healthcare and so on. To enable the Internet of things, different technologies and standards have been proposed. Among them, the IP for Smart Objects (IPSO) alliance promotes the use of Internet Protocol (IP) as the network technology for IoT. The Internet Engineering Task Force (IETF), as part of its IoT related activities, has been working on using IPv6 to connect devices in low power wireless personal area networks (LoWPANs). The devices operating in LoWPANs are constrained on resources such as memory, processing power and sometimes energy (in case, they are operating on battery). Hence protocols designed for such networks have to consider the limitations of the devices. There has been considerable research done to design protocols that enable and support IPv6 in LoWPANs. However, there is not much effort in the area of multicast communication. There are various scenarios where efficient multicast communication would be beneficial. For example, consider a group of lights in a room that can be controlled by an actuator. In such scenarios, well designed multicast protocols would be useful in saving resources of the nodes. In this thesis, we design and implement a multicast routing protocol for low power and lossy networks. The protocol is implemented on Contiki OS, an operating system developed for the Internet of things. In addition, we test this protocol using Cooja, a cross-layer simulator developed for Contiki OS

Monitoring multicast traffic in heterogeneous networks

Estágio realizado no INESC - Porto e orientado pelo Prof. Doutor Ricardo MorlaTese de mestrado integrado. Engenharia Electrotécnica e de Computadores - Major Telecomunicações. Faculdade de Engenharia. Universidade do Porto. 200