Issues in Multicast Security

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Abstract

Multicast communications introduce significant novelties both at the Network and Transport layers. The relevant applications, on the other hand, have special requirements, determined by the real-time and multimedia nature of the data and by the large number of receivers. This paper first discusses the basics of multicast routing and transport, and the concept of a multicast “session”. Then, it analyses the security services that are needed and the difficulties that arise in this context. The techniques that have been proposed for solving different multicast security problems are briefly surveyed.