By allowing intermediate nodes to encode the received packets before sending them out, network coding improves the capacity and\nrobustness of multicast applications. But it is vulnerable to the pollution attacks. Some signature schemes were proposed to thwart\nsuch attacks, but most of them need to be homomorphic that the keys cannot be generated and managed easily. In this paper, we\npropose a novel fast and secure switch network coding multicast (SSNC) on the software defined networks (SDN). In our scheme,\nthe complicated secure multi cast management was separated from the fast data transmission based on the SDN.Multiple multicasts\nwill be aggregated to one multicast group according to the requirements of services and the network status. Then, the controller will\nroute aggregated multicast group with network coding; only the trusted switch will be allowed to join the network coding by using\nbroadcast encryption.The proposed scheme can use the traditional cryptography without homomorphy, which greatly reduces the\ncomplexity of the computation and improves the efficiency of transmission.
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