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Many researches about Binding between Mobile IPv6 techniques and Wireless MAC are ongoing. But, Studies related to security hardly ever are conducted. In paper last time, we proposed Optimized Cryptographic Binding Protocol (OCBP)[2]. OCBP that bind between IEEE 802.16e Security Protocol (PKMv2 EAP method) [1] and MIPv6 AAA bootstrapping authentication procedure [15][17] supports more efficient authentication/Key distribution than non-binding case. We propose on "Extended OCBP scheme" for becoming higher than basic OCBP security level.

In the mobile telecommunication network, the expansion in Internet traffic will cause the demand for IP addresses. Further WiBro will also stimulate the interworking for IP addresses. In fact, many working groups are designing an adaptation mechanism between WiBro and IPv6/MIPv6. Accordingly, from the viewpoint of security, interworking between 802.16e and MIPv6 is essential. In this paper, we propose a secure and efficient OCBP(Optimized Cryptographic Binding Protocol) between Layer 2 and Layer 3 of WiBro system.