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Multicast is efficient method for group oriented application such as video conferencing, interactive group games and video on demand. IP multicast saves band-width by sending traffic to many clients simultaneously. Multicast is efficient method to deliver data from one sender to many receivers as compared to unicast. It also has many popular application such as broadcasting video, games, stock quotes. Use of multicast makes it attractive but it leads to some security flaws so the authors have to provide security.