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IEEE 802.16j Multihop relay network is an important research topic, because it can effectively extend coverage. There are some issues requiring deeply thinking in the multihop relay network. One of the major issues is hop-by-hop authentication of relay nodes. Another issue is the selection of centralized or distributed security architecture. In this paper, we study the two schemes for authentication in multihop relay network in order to explicitly make a choice which security architecture can better achieve our goal.