This paper proposes an efficient and secure binding update authentication method for mobile IPv6 route optimization between a mobile node and its correspondent node. The proposed scheme assumes that the MN (Mobile Node) shares the password with the CN (Correspondent Node) and incorporates the PAK (Password-based Authenticated Key Exchange) protocol to authenticate the BU (Binding Update) message and derives the session key. Therefore, our proposed method can avoid the need of external security infrastructure like PKI (Public Key Infrastructure) and protect against the attacker who resides on the path sharing the same data link with CN.
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