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The Multimedia Broadcast Multicast Service (MBMS) has been included in the 3GGP architecture to provide broadcast/multicast services. In the 3GPP Long Term Evolution, the evolved MBMS (e-MBMS) architecture is currently being standardized. This position paper discusses the security issues currently being considered for the e-MBMS IP multicast user plane. Currently proposed security architectures "Limit" themselves to include Group Security Associations (GSA). In this paper, the authors raise the position that GSA might not be a sufficiently secure solution in the long run. In sight of this, they propose to adopt a secure multicast overlay approach as a possible short-term solution, thanks to its straightforward deployment. To prove this latter point they overview how to set-up a proof-of-concept implementation over public domain Linux routers.
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