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This paper proposes a mechanism to secure the mobile IPv6 networks by integrating identity based cryptosystem with cryptographically generated address. Based on an in-depth analysis of attacks and countermeasures in the CGA-based protocols, this paper gives an analysis of the so called ”unauthentic key attacks”, and presents a mechanism to solve this problem by integrating an IBC scheme called Combined Public Key (CPK) with CGA. Both the deployment considerations and performance analysis of this IBC-CGA scheme are present in the paper.