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Mobility of the nodes in mobile ad hoc network usually made huge change of network topology. This challenges the secure of the group communication quite a lot. Group key agree management model and security model for the MANET is presented in the paper. And group key agree management scheme was also provided. This scheme is much suitable for MANET which is based on GKDS. Besides this scheme has the characteristic of self-initialization, closeness, completeness and small data reserves.
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