It is a kind of register home agent registering mobile node home address network in. Instead of using mobile node home address as key element be identification mobile node, home agent includes the register flow path for being sent to home agent in registration request (1) by mobile node using the identity of network insertion node. When receiving registration request, home agent verifies (2) mobile node by selecting security association (3) appropriate to be based on network insertion identity. In response, (4) home agent can issue identification and keying material to mobile node, to allow mobile node further by home agent and mobile node certification (5) for inquiring process.
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